Wow Bill, what a beautiful rifle. My sincerest admiration.
I went back and re-read some older threads on Niedner rifles.

This thread was really helpful.
Niedner thread

So, I took the action out of the stock and looked for a number and initials on the bottom of the barrel 1475 CB which would put the rifle as being made approximately 1938 and being rifled by Carlyn W. Behrman.

I also took off the butt plate,


I don't know how well you can see this, but it is stamped
"T SHELHAMER FOR BEN COMFORT"

Truthfully, I never knew who Ben Comfort was until I saw this and googled him.