Approx. 6,000 Marlin O.K. model deringers were made in 22, 30, and 32 rimfire calibers from 1863 to 1870. The 2.75"" octagon to round 22 caliber rimfire barrel has a good bore with rifling wear. The top of the chamber is marked O.K. The right side of the breech has the standard Marlin markings which are barely visible. The barrel has a gray/brown patina. The brass frame is very good with staining on the right side and with the remainder having an even aged patina. The rosewood grips are good with a small chip on each at the lower frame junction. The action functions correctly. Don't miss this scarce O.K. deringer!