Anyone know the year of this colt 22 conversion it’s a parkerized finish?? Year and value?? C973A46D-B86B-4478-86DF-C03DEF6CFEFE.jpg it has colt mfg co Hartford ct USA

They were never parkerized. It's from the mid 50's. Hard to tell from the small single pic, but if it's complete with it's #2 slide stop and period correct magazine they typically SELL in the $400 range. Figure a bit less with it's non-original finish.