marking on a 98k mauser...

[Van]

Sorry for the blurry pic, it was done hastily, is the marking on this 98k common or not that common.. I am familiar with "dot" "byf" and a few others, I have not seen this marking before.... thanks for any help... it is either dau or dou???

Van

[Gene]

dou is the code for Waffen Werke, Brunn, Bystrica

[Van]

Thanks Gene... appreciate the information....
Van