42 luger

I'm hoping someone can give me a little help on a luger I own.It is a vet bring back .It is marked BYF 42.Something has been ground off under the barrel and on the on the side just above the safety. What would have been there?All numbers match.The blueing on the high points is a little thin but other than that blueing is in good shape .Has perfect barrel and shoots like a dream .I would never sell this piece but what would a pistol like this be worth?Any help would be appreciated.


Bob