John, Blued folded mags were introduced by Mauser in mid 1937. Chrome floded tube from 1930 until mid 37 at Mauser and the blued code 122 type mags started appearing in late 1939 and changed to FXO code in 1941. Early DWM & Erfurt mags wer nickel plated until 1916, when tin plating was introduced. There were some exceptions and other types used by the Police. TH
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