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You are right so far. Fat or perch belly stock was unique to Eddystone.

Pattern 1914s don't have a date on the receiver like the Lee Enfields. ERA is a maker marking for Remington's Factory at Eddystone Pa. Other than this, I don't understand your "What do I have"?

9124591246

Overall condition would seem to indicate that this rifle spent some time in India. It is not remarkable other than the low serial number and characters used, broad arrow/RE/00902.