Welcome to the forum Doc.
Hard to say exactly without better pictures, but I'd bet your pistol is a 1900 Swiss.
Interesting that a privately purchased piece would be on a Kriegsmarine man-o-war.
If you have some documentation from your father, the German, or whomever, your gun would have serious value as a historic artifact. Without the documentation, in the condition you describe, the gun should command Between $5500 and $6500 USD.
Hope this helps.
Tom A
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