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Don't get too hung up on searching for temporal coordinates to the exclusion of the unit's real purpose as a musical instrument.
Some of the component parts of Hammonds and Leslies have EIA codes printed on them.
Inside each Leslie produced after 1956, on the lower baffle, is a date code (sometimes hidden by the bass speaker).
Some specific examples are cited that can be used to provide assistance in identifying the production date of similar components. Tung-Sol 6550 tubes have the following format: XXXYYWW, where XXX is the EIA manufacturer code, YY is the last two digits of the year and WW is the number of the week in that year.
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.
3227204 is a Tung-Sol tube manufactured during the fourth week of 1972.
Tung-Sol 6550 tubes made for other companies (like RCA) have a four-digit date code only.