I knew Klaus and his late wife, Hiedi Marie, quite well when they were working in Kelowna BC. Klaus was an excellent workman with a bit of an antipathy toward power tools. His stocks were of the American Classic style and all were carved from the blank.
Engraving was done by Hiedi and was world class. I used to do some work which was outside Klaus' area of expertise/interest and I enjoyed seeing him turn a blank into a stock. I was amazed at the speed and ease with which he inletted, shaped, finished, and checkered a stock; all without turning on a power tool of any sort.
I wish I had some pictures to send you but I don`t.
The style of stock and rifle produced by Klaus was generic enough, at the time, to have been duplicated by any number of other makers. If the rifle was engraved, Hiedi`s engraving would be fairly recognizable and might even be signed. I don`t recall Klaus marking his stocks in any particular way; though he might have done so. GD