If your handguard is also original it should have a "capsule-shaped" indentation
on the inside (barrel side) of the handguard. I have commonly heard this feature called a "fixture slot", presumably a means of securing the wood in position as the wood was shaped. I believe that Conrad Nelson approved handguards at RIA would have this feature and WW1 rifles would not.
I have a CN/1911 stock with a JLH/1918 overstamp and the handgurd has the "fixture slot".

Ogtree
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