New to Lugers trying to find out what this one is. The toggle says ERFURT but I think the Imperial stamps look like GSS. The serial number is 363 on the upper and lower. I assume barrel was changed I only see. 9 (6?) on the bottom of both ends. The grips must be some aftermarket ones. They are very loose and not wood. No marks on the inside. Lots of hard to see marks that I can't seem to find a reference to. Possibly a 20 and a 3 in a square in the rear of the upper frame. I'm guessing this would be a shooter and is worth around $1000.