Union Switch and Signal Model 1911 A1 .45 ACP. Serial number 1088563 is a high condition example of this desirable military variant. MARKINGS: Frame right is marked “United States Property, M 1911 A1, U.S. Army”, along with the serial. Frame left is marked “RCD” and “P”. The top of the slide (centered ahead of the rear sight” is marked “P” and the left side is marked with the USS logo and “U.S. & S. Co., Swissvale, PA. USA”. The right side of the barrel is marked “HS” and the left side “P”. Grips are internally marked with the “Star K” and (alternately) “8” and “12”. Neither magazine is marked. CONDITION: All markings are tack sharp. Mechanics are proper and the slide-to-frame fit exceptional. Exterior finish is at least 95 percent, with slight silvering tracing along the edges. Finish over the barrel hood has browned. The bore is very good, with minor roughness observed in the chamber, lands and grooves. Grips are solid, screws unmolested.