Great information...please keep it coming. I scoured the net and found some tidbits but not amounting to too much.

Raimey, the one pictured is in 16x16 x 8x57iR. A relative has it and I will have access to it soon. It has its original Zeiss Zielvier with Montage mount. I believe it's late 20s but can confirm when I have it in my hands. It also has two initials in gold on the removable trigger hence I was hoping Krieghoss has records to determine whom it was made for.