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.
100-400 USD or so
200-2000 USD depending on EXACTLY what you have.
100-550 USD
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."