Model 15
It should be a model 15-2 and manufactured in 1979.
100-400 USD or so
Dan Wesson is now operated by CZ USA. Barrel nuts are available for about $15 plus shipping. See the link at the bottom of this page to link to the CZ parts page for Dan Wesson Revolvers:
Is it a model 15?
If it is a blued 357 with adjustable sights, it is probably a Model 15.
With the serial number that you have supplied,your Smith and Wesson model 15 was made in the year 1950.
The smith and wesson model 15,4th change (15-4) was made by smith and wesson in 1977.
Yes, S&W made a Model 15-3
67-77
I can say that your smith and Wesson model 15-2 .357 magnum was made between the years 1961-1966.
No published sn data that I am aware of.