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

Earlier Leslie motors have a stamped four digit code.

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.

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For additional speaker manufacturer codes, see Ted Weber's listing at Weber Speakers.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.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.

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