4 in. barrel, marked mod 15 and no dash, diamond grips, has trigger guard screw, number k424xxx, like new with a very lite rotation mark, never had a 15 before, just picked it up.
No 3 on the side plate, and one trigger guard screw. The grips often cover one side plate screw. Any K or N frame with the trigger guard screw is either a 4 or 5 screw gun automatically.
Thanks a lot, I did not think it was that old, It's I would say a good 98% was fired very littly and was kepe in a good place, the finish is a deep fantistic blue, I would like to find a worth on it but its not going to be sold!
Precise valuation depends on condition and the region of the country you're in. In some parts (e.g. south) revolvers are common and less expensive than in the N.E. part of the country or California. As a "best guess" I'd say $350-$400 for a nicely preserved Model 15-1, circa 1960 like yours. Your specimen was made in 1960 according to the serial number. Yours should be stamped Mod 15-1 under the cylinder yoke.
S&W Model 15's shown in 2" and 4" barrels. Target grips are Post 1984 with speedloader cut. Magnas on the 2" are factory stock.
The Model 15 came in 4" and 2" barrels and very late production included a six-inch barrel (overlapping it with the model 14). These are the successors to the pre-1957 K-38 Combat Masterpiece and are excellent shooters. The fact that they have great eye appeal is a nice bonus.
The diamond grips are getting harder to find. If you shoot it, I'd suggest buying aftermarket grips for shooting so as to preserve the diamond Magnas. K-Frame "target" grip replicas can be ordered from Eagle Grip's Heritage line of grips.
For what it's worth, I keep a stainless version - Model 67 - as my bedside gun because it's one of the guns I shoot the best.