The riddle of the letter-number combination

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Under the balance wheel: Code B2

Often under the balance, sometimes under the dial, there is a letter and numerical code representing the month and year of production of the movement (or at least the plate).

One letter for the month (A = January, B = February, etc.), one or two numbers for the year. That is, a watch made in February 1962 has the stamping B 2.

Since the year is known to have twelve months and the L is the twelfth letter, would have to be end with the L. To avoid confusion with the letter j or the number 1, the letter i was omitted, the letter M was used as the month of December.

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Junghans J82/1; Werk, movement; Code M4