One thing to remember in this chronological quest is these instruments were built to be played, not (in most cases) to become museum pieces.Don't get too hung up on searching for temporal coordinates to the exclusion of the unit's real purpose as a musical instrument.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.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.
285642 would be a Rola speaker made in the 42 week of 19x6 (you have to figure out which decade using other information).
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.
Some of the entries on the age list show actual known production dates and can be used as markers to guage the quality of other entries around them.
James, Tom Tangen, Jazzie Mahannah, Jolene Purdy, Stuart Stone, Gary Lundy Actors: Tom Cruise, Max von Sydow, Steve Harris, Neal Mc Donough, Patrick Kilpatrick, Jessica Capshaw, Richard Coca, Keith Campbell, Kirk B.
To help determine the manufacturing date of Hammond organs and Leslie speakers.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.