The "f" is the cursive letter under the word "Germany" under the numeric part of your serial number.
Take a look at the technical reference section of this site, and look at the cursive letters listed.
I agree that $600 is about right for this as a retail price. Perhaps $500 to a collector that wanted a .30 Luger shooter.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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