.22 LR. 4.5" barrel length. SN: 24661-C. Blued metal finish with checkered brown synthetic grips mounting drift adjustable rear notch and matted front blade sights. Simple blowback operated concealed hammer autoloading pistol fed by detachable single stack magazines. The left barrel is struck with the single line address mark reading COLT'S MFG. CO. HARTFORD CT. U.S.A. followed by the {Rampant Colt}/CHALLENGER marking. Left slide is struck COLT AUTOMATIC/CAL. 22 LONG RIFLE. {C&R}