Strange

The frame looks pre 1913 millitary, as previusly said, no stock lug and also I noticed a later added hold open. I thougt that would never been found on comercial Lugers ??
No year mark would tell us 1909 but the rest of the markings wont fit to that ?

Also the ser. number would fit in the 1909 production, Right ?
I would guess this is a first contract 1909 with later armorers or factory replaced and force matched upper.