Utah Shotgunner,

I know where I saw this buttplate before - it like the one on your recent 1950's Paul Jaeger custom rifle post. Mc said earlier it is a Niedner butt plate.

Interesting points on the S/N question. The bolt on my 1918/1920 service rifle has a rearward sweep to it. It is not straight down like the one on the Mannlicher. I will have to look in the Poyer book.