The stock has a POD stamp which identifies it as having been mounted on a rifle which went through inspection or overhaul at the Philippine Ordnance Depot, located at Fort Santiago, in Manila. The stock also has a "RI" stamp on the forward tip, which means it was mounted on a rifle made from 1917-1919 at Rock Island Arsenal.

I don't have any pictures of the stock, at the present time, or else I'd post them.