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There are a number of visual cues: anything with a foil CBS ID tag is post 1966, anything with a metal tag is prior to 1966.The typewritten silver foil tags appeared in the mid to late 70's.
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.
In the example shown, 190-7215 was made in the 15th week of 1972.
Earlier Leslie motors have a stamped four digit code.
Later Leslie motors have a sticker on them indicating their manufacturing date.
The formula is XXX-YYWW, where XXX is the manufacturer EIA code (190 indicates General Instrument in the present example), YY is the last two digits of the year of manufacture, and WW is the week of manufacture.
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.
Until this work is published, the Age List will continue to function more or less as it has; a quasi-definitive source of this information and a registry of Hammond and Leslie product owners.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.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.However, by examining those components as a group one can determine that the instrument was produced no earlier than the latest date indicated by its component parts.