I would check with numrich gun parts corp.first.they can be found on the web.
02/14/2010. I just bought a very nice one today at a gun show for $160.00.
Nobel Arms
Should be a version of the Marlin 336. Wards sold the Marlin under the Western Field brand name through the 1960's until they switched to Mossberg in 1971.I've found that the Western Field Model 33A was made by Noble.
Not AFAIK
a diagram of a periscope
$200 USD
I believe Noble Man. existed from 1950 to 1970
POSSIBLY your rifle is a Noble Model 275.
2a2+33a+136 = (2a+17)(a+8) when factored
Contact the maker.
No.