BillK, this is a fairly typical example of higher end German gun making. Kettner was/is a large retailer of all things hunting in Germany. This gun was almost for sure made by one of their makers/manufacturers and not in an in-house shop. They retail a wide variety of guns. The engraving is not unusual for German guns. As for date, not earlier than the 1890's or later than WW I, most likely, maybe. The proof marks will tell the tail/tale. The trigger guard will not be a problem, IME.
Let us know how it is and what you think when it arrives. Nice find!
DDA
