Me too, I have a relic example said to have been dug up in Normandy and it is a favorite in my collection.
I checked the book and if yours is marked byf, then the 42 is the date as this version was only made in 1941 & 1942. There was a commercial version of this, marked W after the serial number which was for Portugal, though if it is marked ku on the right side of the chamber it would be a much rarer model made for the Kustenfleigerstafflen (coastal flying service).
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