Hi, and welcome to the forum!
First, you have a 9m Luger, not one in .30 caliber.
The letter under the serial numeric digits on the frame and barrel is a suffix, and part of the serial number. I can't quite make it out, but it's probably a "f".
Odd to see the "GERMANY" stamp on one of these.
The lack of paint on the safety area, and the grainy looking finish make me think that it might have been refinished at some point. You would typically see halos around the serial number digits stamped into the barrel on an original finish gun.
It's marked in the military way, and may have been something unissued that was brought into the USA between the wars.
Any specific questions?
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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