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Decode publishing codes on manuals?


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Does anyone know how to decode all the publishing code information on 1950s-1960s Leica instruction manuals?

For example, an English language M3 instruction manual is marked at lower left (back cover) IX/57/DY; I assume the IX/57 is for September 1957, but what does the DY mean?

Another English M3 manual is marked XII/59/DLX/SD. Maybe the letters after the year show distribution-selling regions?

All suggestions will be useful, while I try to learn how many versions and dates of the M3 instruction manual were printed, starting from my earliest (so far) marked III/54/DLX.

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