Varies by type/model of weapon.
Smith and Wesson have never used AT. It should be three alphabet letters, i.e, AAA12354
Smith & Wesson M76
No
Smith and Wesson
governor.any Smith and Wesson revolver that was made prior to this year(the govenor) that is chambered for a rimless designed cartridge.This includes the .45ACP, the .40S&W,and the 9mm luger cartridges.
The Model 10 has always used serial numbers.
NO
62092
No.
wesson. .44 calibur.
a smith and Wesson 500
Letter frame sizes are used by Smith & Wesson. Dan Wesson Firearms is no relation to S&W, and does not use a letter.