Robb Stewart has put together some improved serial number dates based on
more recent discoveries. His data can be found here.
Below are my original guesses as to beginning-of-year serial numbers for pre-1952 Olds horns. You can read my reasoning for the pre-1946 numbers, or the 1946-1952 numbers . In arriving at these numbers I have attempted to reconcile the Robb Stewart data with the firsthand reports. I welcome any evidence that can help me improve on these guesses:
Note: According to longtime Olds employee Don Agard, the trumpet and trombone serial number lists were not combined until 1953. This conflicts with the Robb Stewart article, which was also based on interviews with former employees. Since this began as a study of trumpet serial numbers, most of the data collected has been from trumpet owners, so the impact of this discrepancy is probably minimal on the actual trumpet serial number charts. However if Mr. Agard's account is correct, trombone serial numbers lagged behind trumpets until they were merged in 1953. According to Agard, the last 1953 trumpets being in the 68,000 range while trombones in the 48,000 range. This does not agree with the published serial number records, which indicate that they reached 90,000 in February 1953 and 100,000 in October 1953. I don't know how to reconcile these accounts so I'll just present them as data collected. At worst, they create some uncertainty for manufacture date of trumpets/cornets in the 70,000-100,000 range (but the uncertainty is at most a year or two). For trombones, the uncertainty for horns prior to 100,000 would be substantially greater. Note that discovery of a trombone with a serial number between 48,000 and 100,000 would disprove the Agard account. I don't have evidence that such a trombone exists but I haven't really looked hard for it since my focus has been on trumpets and cornets.
UPDATE: I now have a report of an Olds Recording trombone s/n 56,668. That suggests that trombone serial numbers went higher than previously thought before the merger of trombones and trumpet into a single serial number sequence.
Jan 2004: an Olds Super trombone was seen on ebay with a serial number of 54,571...even including a nice closeup of the serial number. This doesn't completely disprove the Agard account but at least it means trombones went at least to 54,571 before the merger Agard describes. We would need to see trombones in the 6x,xxx / 7x,xxx / 8x,xxx / 9x,xxx ranges in order to dispute Agard's account with much confidence.
Aug 2006: Revising the early trombone dates due to discovery of #4016 with original paperwork showing a manufacture date of 1923!
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