Following data was taken from Standard catalogue of S&W 3rd edition.
Ex flatlander: Your j frame falls in the serial number range 295000-786544, for the years 1962 to 1969. If it has the original grips and has an uncheckered diamond around the grip screw, then it is probably earlier than 1968.
Dragk913: Assuming your gun has an exposed hammer, then it would be a .38 double action 3rd model, made between 1884 & 1895.
The Model no. 3 was a six shot revolver, usually in a .44 caliber, so your gun is not a No.3.
Sundance001: The BBF serial range started in July 1988, your friends gun probably dates to that year. The unfluted cylinder was for the 629 Classic Hunter from the same year, but should have an AVZ serial prefix. You may have a gun put together with a cylinder left over from that run.
The Classic Hunter had rubber Hogue grips, a six inch full lugged barrel, black ramp front sight and a white outline rear sight.
Mike the wolf: Your gun falls in the serial range for 1976 to 1977, being j370001 to j610000. It is an aluminum framed gun based on the small J frame, with a steel cylinder and barrel. The airweight reference is to the lighter aluminum frame. Originally these were known as the Bodyguard Airweight.
Production was discontinued in 1999.
Speedo: Your gun falls in the serial range for 1977-1978. Introduced as the .41 Magnum Target in 1964, discontinued in 1993, yours should be a pinned and recessed model.
Fred T Your first gun should be a S&W pre-model 30, the .32 Hand Ejector.
Post war production started at serial number 536685 and a design change was implemented in 1956 at serial number 640980. At a guess I would put your gun the the late 1940s. Your second gun should be a S&W Hand Ejector Model of 1905-4th change, manufactured between 1915 & 1940. Standard barrel lengths are 4, 5 & 6 inches. If you have a 5.5 inch barrel then it is an oddity. Your gun dates from after heat treating of cylinders was introduced.
GreenMTNLife Your 686-2 dates to 1987. The serial number prefix was used on some model 629s that year as well.
Greymutt: Your S&W Safety hammerless has a serial number falling between 1898 & 1907. The front sight is pinned and could have been replaced. Standard barrel lengths are 3& 1/4, 4, 5 & 6 inches. 1 & 1/2 & 2 inch barreled versions exist and go for a high premium. If you do have a custom barreled gun it may have a custom sight. Or it may have been cut down by a gunsmith and a new sight fitted. Prices for standard models as follows:
As new $600, excellent $500, fine $265, VG $235, good $175, fair $15, poor $60. I suggest you post a picture as some short barreled guns in new condition have sold for over $3000.
Bill Boucher: June or July 2004.
bigwhiteyj: the 10-9 was introduced in 1988 and deleted in 1996. I can't give you better than that.