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Recently, the production data was found and there is no longer any need for guessing.

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.

285642 would be a Rola speaker made in the 42 week of 19x6 (you have to figure out which decade using other information).

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

Inside each Leslie produced after 1956, on the lower baffle, is a date code (sometimes hidden by the bass speaker).

Here's how it works: You have to be able to date the Leslie within 10 years, which should be fairly easy.

Thanks to the Electronics Industry Association (EIA) code conveniently placed on them by the manufacturer, many individual components can be dated to the year and week of production.

Due to Hammond and Leslie purchasing components in large quantities, using these codes as definitive signposts will not produce an accurate "born on" date.

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.

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