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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.

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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.

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.

To help determine the manufacturing date of Hammond organs and Leslie speakers.

Use this form if you would like to submit your Hammond Organ for inclusion in these tables.

Just to get started, 21H's are 1951 to 1958, 22H's are 1958 to 1963, 122/142/147/145's are late 1963 and later.

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