Trying to help a friend. S&W Airweight snubbie in .38 special CTG. Six round with square butt. Serial number is D665752. Person that has it says it is all steel (checked with magnet). But it looks like black paint to me (from photo). At first I thought it was the airweight chief's special but the six round added info makes me think some other airweight. What other airweights were made in a six round revolver?