Adding to MFC's corrections, the triggers of military and commercials are similarly marked, the "main assembly pin" was not serial numbered until the 30's, front sights ceased to be marked early( I believe the adjustable artillery sights were #, the "striker"(firing pin) was not grooved until the 30s and it was to relieve pressure from a pierced primer not for oil. Finally, if no stock lug is present it would be a 1908 commercial not a later one. Maybe a little too late to try to impart information.
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Rich
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