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All available information must be taken as a whole, and, combined with some general tips and observations provided below, a narrow range of probable production years can be arrived at which in many cases will be accurate enough for most people's desires.
One thing to remember in this chronological quest is these instruments were built to be played, not (in most cases) to become museum pieces.
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To include a Leslie speaker or Hammond Tone Cabinet see the bottom of this page. Beginning in late 1935 and continuing to mid-1975, the archetypal instrument we think of when hearing the word "organ" was produced by the thousands.
Please include an email address so I can contact you if I have a question. With a production history covering more than forty years, determining the exact manufacturing date of tonewheel Hammonds used to be difficult; new models were not introduced every year and production changes that were made were often subtle.
Tubes with "Hammond" silk screened on them typically have a code consisting of two pairs of numbers separated by a dash.
The format is YY-WW, where YY is the last two digits of the year and WW is the number of the week in that year. Many capacitors have a date code on them, but some do not.
Additionally, some organs have been pieced together in order to get one working unit out of many; this will produce inconsistent and unlikely date code ranges.Inside each Leslie produced after 1956, on the lower baffle, is a date code (sometimes hidden by the bass speaker).Here's how it works: You have to be able to date the Leslie within 10 years, which should be fairly easy.Recently, the production data was found and there is no longer any need for guessing.This information is being compiled, organized and edited into a soon to be released book that details all sorts of production and manufacturing information, including tables showing serial numbers and their date of production.