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For additional speaker manufacturer codes, see Ted Weber's listing at Weber Speakers.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.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.Most of the tone generator wax and Mylar capacitors do, as well as pre- and power amplifier multi-section can electrolytic capacitors.

The code typically takes the form of YYWW, where YY is the last two digits of the production year and WW is the production week. All of the speakers in Hammond organs, Hammond Tone Cabinets and Leslie cabinets dating from 1946 forward that I have seen have production date codes stamped on them. The coding scheme is XXXYWW where XXX is the company EIA code (Jensen = 220, Rola = 285, Heppner = 575), Y is the last digit of the production year, and WW is the production week.

In the example shown, 190-7215 was made in the 15th week of 1972.

Earlier Leslie motors have a stamped four digit code.

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.