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During WWII their code was byf in small letters.

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That is correct in that "byf" code K98k's are the most common Oberndorf code. The byf code is, however, only one of several codes used to designate Mauser Oberndorf during WWII production. In chronological order they are:

S/42K (no year)
S/42G (no year)
S/42 (4-digit year)
42 (4-digit year)
byf (4-digit year)
byf (2-digit year)
svw (2-digit year)

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