John,
Welcome to the Forum.
This appears to be a well worn, but overtly honest 1936 Model P.08, the standard issue of the day to the German Armed Forces.
The letter suffix is a "k' indicating it was made in Spring 1936 at the Mauser Factory in Oberndorf am Neckar.
Somewhere along the way, it was proofed in the UK. The crossed swords and letters and initials indicate the Birmingham Proof House.
More, I cannot say.
Hope this helps,
John
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