Maybe NOT a Hebrew stamp! Probably more of a a "casually applied" stamp.

The Eddystone, (ERA), P-14s are notorious for being "non interchangeable" Remington (RE), (who used the design as the basis for their later Model 30 sporting rifle) and Winchester, (WRA), seemed to have better QC and MUCH less variability of "fit". As many folk discovered in later years, Eddystones often have EXTREMELY hard breech rings that made drilling and tapping for scope mounting into an "interesting challenge".