1939 Ishapore

[tlvaughn]

and can find no references concerning the butt markings (ESA?).

If you look closely, I think you will find that the stamped letters are or should be ESA over A. I have this on three of my POF Mk2 rifles and asked the same question a year or so ago with no response.

I have tried to research it, but the only thing I was able to find is an Indian exporter - ESAA Exports. I was not able to connect them to the rifles, so I still do not have an answer.