Springfield only made 25,000 ,model 1911s and this one has seen considerable service and reworking. The AA for Augusta arsenal reworking pre WW II is on the left side of the frame, as pictured. Because it has seen so much use, folks kind of value it not so much. However reserach and a letter and a copy of the actual document from the Springfield Research Service shows this 1911 was used during the mexican punitive expedition with pershing in 1916. The list of guns actually proven to be with the apx 10,000 troops is less than a couple hundred on the document. Some folks would not care, but this is one of my favorite pieces because it is so well documented to an infamous historical event.