Hello donmor53 and welcome to the board.
Magazines issued to Military Mauser pistols would have the suffix a stamped under the numbers for the primary mag and the spare would include a + under the suffix. Also the font size and style should look similar to the numbers stamped on the pistol. It is possible that your pistol was issued without numbered mags, Mauser stop numbering mag towards the end of 1941 though 1942.
Chris
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