Created by modifying an Officer's Model frame to accept a special flat single-shot "cylinder". This flat chamber pivots to the left side and downward for loading. Chambered for .22 LR and offered with an 8" (early production) or 10" (late production) barrel. Finish blued, with checkered walnut grips. Name "Camp Perry Model" stamped on left side of chamber; caliber on the barrel. Colt named this model after the site of U.S. Target Competition held annually at Camp Perry, Ohio. Colt manufactured 2,525 of these between 1920 and 1941. NOTE: This gun serial numbered 101-2525 with 2488 produced from 1926-1941. In 1934 standard barrel length was reduced from 10" to 8" at approximately serial number 2150. Add 100 percent premium for 10" barrel; 50 percent premium for original box.