Square P and ESSA on M1917 Stock

[c&rfan]

Thanks Calif-Steve.

I have the upper hand guards, they're just not pictured as I can't get the front sight off to put them on the rifle. Dropped it off at a gunsmith this morning to get that rascal front sight off.

Any thoughts on the Square P and ESSA marks on the stock?

I can't give you an answer as to why the P is in a square instead of a circle but my Underwood M1 Carbine has the same mark: