A rifle marked "St.G" (or SG) = St.Gallen (Switzerland).
[EDIT] Who knows why a German rifle got a Swiss mark ?
I DO know that both those European countries (and more than a few more) systematically "proofed & ergo, proof marked" every single firearm imported.
The white paint filling the stampings is not necessarily original, since it was once common to highlight such for easy ID and (in some eyes) beautification.
There's a LOT of commercial rifles out there, for instance, that have their lettering/caliber mark/etc filled with gold paint.
Some military units used paint on the wooden stocks, however - also encountered fairly often.
Last edited by PetahW; April 18, 2009 at 07:37 AM.