Identifying and Dating Kimball Pipe Organs

The size of the number settles which series it belongs to. A reed-organ trade compilation gives Kimball reed-organ serial numbers running from 26,472 in 1881 to 403,690 in 1922, the year it states that reed-organ production was discontinued, and the Reed Organ Society’s own database gives the same range across the 176 Kimball reed organs its members have registered. A piano-trade compilation puts Kimball piano serial numbers at 322,000 in 1920 and 383,000 in 1930. In those same years, Kimball pipe organs carry four-digit numbers: KPO 6763 for the 1924 instrument at the Scottish Rite Cathedral in St. Louis, KPO 7073 for the 1930 instrument in Atlantic City’s convention hall, and KPO 7066 for a 1931 Chicago church.

That is a comparison of magnitudes across separately compiled sources, not a statement by any one of them that the series are unrelated, and the reed and piano tables are trade compilations that do not state where their figures come from. It is strong enough to keep a reader away from the wrong chart, not strong enough to say how Kimball assigned its pipe-organ numbers, and it identifies the series, not the instrument. A six-figure number on a Kimball instrument is a reed-organ serial number or a piano serial number; a reed-organ serial number is not a pipe-organ opus number and cannot be read as one.

The two product lines also ran on different calendars. On the trade compilation’s account and the society’s, the reed-organ line ended in 1922, while Kimball pipe organs were still being numbered in the 7,100s and 7,200s through the 1930s. The reed-organ line, unlike the pipe-organ department, has an organized, institutionally hosted register, and the 176 instruments in it are a count of what collectors have registered, not a production total. A reed-organ serial number belongs to a line that shares neither its numbering nor its records with the pipe-organ department, and it cannot date or identify a Kimball pipe organ.

The commercial piano serial-number lookups address pianos exclusively, so they have nothing to say about a pipe organ. Two independently read Kimball piano-serial pages cover only pianos and contain no reference to organs anywhere, and one of them warns that Kimball piano serial numbers ‘are not fully standardized’ and reflect ‘multiple overlapping systems tied to business and manufacturing changes’ even within the piano line alone. The piano-trade table does not label its numbers by instrument type and does not mention pipe organs.

The rejection rule follows directly. A chart that covers only pianos cannot date a pipe organ, whatever the number, and a piano serial number is not a Kimball pipe-organ opus number. If a lookup page does not name pipe organs in its scope, its table does not apply, and a page that says its own piano numbers may not map cleanly to a single continuous timeline is no guide at all to an instrument it does not mention.

Kimball pipe-organ numbers appear in the record both as ‘Opus’ and with the prefix ‘KPO’, and the two labels refer to the same series. Documented instances with the prefix include KPO 6763 (1924, the Scottish Rite Cathedral in St. Louis), KPO 7073 (1930, Atlantic City) and KPO 7066 (1931, a Chicago church); documented instances with the bare label include Opus 7133 (1933, a Houston church) and Opus 7127 (1934). An independently published monograph on the 1924 St. Louis instrument, hosted on the enthusiast site organbench.com without a named author, carries the prefix in its own title, while the Houston parish page and an Organ Clearing House listing use Opus.

None of the sources that carry the prefix explains what it stands for, whether it was Kimball’s own factory notation, or whether it is a later convention adopted by researchers, restorers and societies. The sources that record these numbers are a monograph, society pages, owner pages, a broker listing and database records, not factory paperwork. The safe reading is to treat KPO and Opus as labels for one number series until a primary factory document says otherwise, and to record the number exactly as the source you took it from wrote it, with that source named.

Opus numbers correlate with date but do not sort strictly by it. Opus 7133 is dated 1933 by the parish page of St. Thomas the Apostle Episcopal Church in Houston, while the lower-numbered Opus 7127 is dated a year later, 1934, in the Organ Clearing House’s own listing: a smaller number carrying a later year than a larger one, from two unrelated sources. Across the wider set of dated instances the numbers rise with the years in general, from KPO 6763 in 1924 to numbers in the 7,100s in the mid-1930s, but the ordering is not strict, and an opus number does not by itself give the instrument’s completion date.

Each of those pairs comes from a different source of varying reliability, a parish history and a broker listing among them, each covering only its own instrument, and the inversion is small. What follows is a rule of thumb: use the number to place an instrument within a few years, and do not convert it into a year or publish a year derived from it. No corrected numbering rule is offered here; the record supports that bracket and nothing tighter.

A single Kimball pipe organ can carry three distinct documented dates, and a bare ‘number equals year’ shorthand collapses them. For KPO 6763, the St. Louis monograph records a contract signed on December 28, 1923, a countersignature on February 2, 1924 by Robert Elliot as Organ Department manager, and installation and dedication recitals on October 29 to 31, 1924. Signing, countersigning and completion span ten months and two calendar years for one instrument, so the year attached to it depends on which event is meant.

Most other sources give only a bare year for their instruments, ‘Opus 7127, 1934’ for example, without saying whether it is a contract year, a completion year or a dedication year, and one instrument’s paperwork cannot show which convention another source followed. When documenting an instrument, name the date you have, whether contract date, dedication date or completion date, and the source that supplies it.

The most direct statement about Kimball’s numbering comes from the monograph on the 1924 St. Louis instrument, and it says the method cannot be known. In its words, ‘Kimball Company records have been most difficult to document however, their total output of organs remains unconfirmed, and it appears that Kimball’s method of assigning Opus numbers cannot be known’. The same document offers, as its own stated possibility rather than a finding, that ‘It’s possible that for every new contract proposal drawn up for another organ another Opus number would be affixed to it and discarded with the contract proposal if it failed to be signed’.

That statement carries the weight of its source and no more. The monograph is an independently published account of one instrument, its author and review status are not established, and it is not an archival record of the company; its remark about numbering is what that document reports, not a description of what the company’s records contain. The proposal-numbering idea is speculation in the source’s own text and is reported here as speculation.

Whatever the number suggests, a Kimball pipe-organ date is expected to fall between the department’s recorded start and its closure. An encyclopedia article gives 1890, when Kimball hired Frederic W. Hedgeland, as the pipe-organ department’s recorded starting point, and the same article and a trade notice in The Diapason agree that the pipe-organ division closed in 1942. Those two years are outer bounds only. Throughout that span the pipe-organ department was a department of the W. W. Kimball Company, one part of one firm rather than a separate organ company, and the corporate story around it belongs to the Kimball overview.

The highest opus number is not a count of instruments. Published totals for the department’s output disagree with one another, and the St. Louis monograph itself describes the opus numbers as stretching well beyond the count of instruments it gives as built; the two quantities measure different things, and the overview page carries the divergence with its attributions.

A contract record is the strongest single document for date and identity because it names the parties, the place and the signing dates. The contract record for KPO 6763, described above, shows what such a document supplies: it names the parties, the place, and two signing dates two months apart, and it ties the instrument to the pipe-organ department through the countersignature of its manager. The two signing dates fix the instrument in time more precisely than any reading of its number.

Where an owner or venue holds a contract, a signed proposal or a dedication program, those papers tie a number, a place and a date together on one piece of paper, which a bare number cannot do, and the dedication recitals recorded for KPO 6763 show how the completion end of the span is documented as well.

An instrument’s identity can rest entirely on builder name, size, dedication date and location, with no opus number in sight. The Diapason’s account of the Reuter Organ Company’s restoration of the 1932 Kimball at Minot State University, a college instrument of 22 ranks, gives extensive technical detail yet states no opus or KPO number anywhere; its identification of the instrument rests on builder, rank count, the dedication date of June 9, 1932 and the location. That is an absence in one article, not evidence that the instrument has no number, but it shows that number-based identification cannot be assumed to be available even from a detailed, independent trade-press source.

Venue and dedication records therefore carry identifying weight in their own right. A dedication date, a rank count and a named building together fix an instrument well enough to search for it and to distinguish it from another Kimball pipe organ of similar size, whether or not a number turns up later.

Records of later work on an instrument can carry the original Kimball attribution and its opus number when the instrument’s own paperwork does not. In the Organ Historical Society’s Pipe Organ Database, the record for the instrument at St. Mark the Evangelist Catholic Church in Norman, Oklahoma, is entered as Schantz Organ Co. (2023) with no Schantz opus number and is recorded as ‘Originally W. W. Kimball Co. (Opus 7035, 1928)’. The same database’s Reuter Organ Co. records include three that name W. W. Kimball Co. as the original builder, among forty-six Reuter records naming an original builder other than Reuter, as counted on September 1, 2026.

An original-builder field records that the instrument at that location began as a Kimball pipe organ. It does not by itself say how much of the Kimball instrument survives, and an absent opus number in a database record may mean that no number was issued or only that no contributor supplied one; the records were counted, not individually opened. Once the original attribution is established, the question of what inside the instrument is original Kimball material is a different one, answered on Kimball chests, controls, and restoration decisions.

The OHS-affiliated Pipe Organ Database appears to label Kimball instruments by opus number, which makes it a cross-checking resource for a number in hand. That appearance rests on the title of an individually indexed record, of the form ‘W. W. Kimball Co. – Opus [number], [year]’; the live site renders its content through client-side scripting, and the record’s body, its search results and any statement of how the database was compiled were not read. That is enough to say the route exists and how it labels the number, and not enough to describe the database as complete or authoritative for Kimball, or to say whether it distinguishes KPO from Opus notation.

Two custodial routes are open to a researcher asking after Kimball company records, and each institution states its own scope. The Organ Historical Society’s Library and Archives, at Stoneleigh in Villanova, Pennsylvania, with an off-site repository in Warminster, states on its Special Collections page that its holdings ‘primarily consist of the archives and business records of numerous American organ builders’, without naming which builders. It directs researchers to its finding-aid search portal, to its archives librarian, or to an in-person appointment to learn whether records for a specific builder are held. The Chicago History Museum’s Abakanowicz Research Center holds more than 20,000 linear feet of archives and manuscripts, including organizational and business records, searchable through its free public online catalog ARCHIE; the museum’s guidance directs a company-specific inquiry to a search of ARCHIE or an email to its research department, and most materials require an in-person visit.

Neither institution’s own page establishes what it holds. An automated search of the OHS ArchivesSpace interface for ‘Kimball’ returned HTTP 403 on September 2, 2026, so nothing about holdings could be read from it, and the ARCHIE catalog is an interactive interface that likewise could not be queried automatically; a refused or unqueried request says nothing about holdings in either direction. The question is answered through the portals, the named contacts or a visit, not by the automated result.

A body of W. W. Kimball Company files existed and was open to an outside author in the mid-1950s. Van Allen Bradley’s authorized centennial company history, Music for the Millions: The Kimball Piano and Organ Story, published in Chicago in 1957, records that the firm gave him ‘complete freedom allowed me to explore the W. W. Kimball Company’s offices, factories, and files’. The acknowledgment establishes access in the 1950s; it does not describe what the files consisted of, where they were kept or what became of them, and the book is chiefly about pianos and reed organs, with the pipe-organ department as one strand. Whether those files survive today, and where, is a question for the archive routes above.

The identified scholarly study of the subject is James W. Guyer’s 2016 Doctor of Music final project on Kimball as organ builders, ‘W.W. Kimball Company as organ builders: their history, instruments & legacy’, issued on April 29, 2016 in the Doctoral Final Projects, Organ (DM) collection of the Jacobs School of Music, Indiana University Bloomington, and deposited as a single PDF under the permanent handle hdl.handle.net/2022/20823. The repository record publishes no abstract and no page count, so the metadata alone cannot summarize the document’s argument or findings. It is cited here as a bibliographic identification only; nothing on this page rests on its contents. Whichever route supplies the number, a documented Kimball identity is built the same way – the number, the date it belongs to, and the record that supplies both, written down where the next person can find them.