Introduced Jan 1990.
Call S&W with the sn and they will tell you.
1961/62
100-400
You need a gunsmith.
The 3914 was made in 9mm
100-500 USD
Best left to a gunsmith.
The ammunition that it is chambered for.
When referring to the .40 caliber cartridge, SW always stands for Smith and Wesson, regardless of the brand of the gun, because the .40 S&W cartridge was designed by Smith and Wesson. The offical name of the cartridge is .40 S&W, just like the official name of the .45 is .45 ACP (Automatic Colt Pistol). People have a habit of leaving off things they don't think are important, so the .40 S&W is commonly called just "40."
100-550 USD
100-400 USD or so
200-2000 USD depending on EXACTLY what you have.