Help with a proof mark

[sheepherder]

Originally Posted by luger.parabellum

...if you compare them with the proofs pictured on pages 95-100 of Randall Gibson's book you'll notice some big differences.

Would any like to scan a pic of Gibson's proof for comparison??? I looked in Sturgess & Gortz and didn't see any barrel proof anything like Mike's...

Looking in Datig, I see a Dutch Army frame "KL" intertwined inside a circle and an early Krieghoff toggle "HK" in a circle that by a stretch of the imagination might look vaguely like Mike's proof...

Here's a scan from Walters' book which may be similar...