Usually it means "Smith & Wesson"
Question can't be answered without knowing the caliber.
Old gun catalogs and magazines
500 s&w
Impossible to know the caliber with only a serial number. It should be marked on the barrel.
the maker.
50-175 USD
10-200 USD or so
Assuming you mean caliber, the caliber simply refers to the diameter of the bullet the gun is designed to fire. American cartridge sizes are expressed as tenths or hundredths of an inch, and European cartridges sizes are expressed as millimeter. A .40 caliber gun fires a bullet that is .40 of an inch in diameter. A 9 millimeter gun fires a bullet that is 9 millimeters in diamter. There are too many variations to list here, but some common handgun calibers are 9 millimeter, 10 millimeter, .40 SW, .38 special, .44 magnum, .45 ACP, .380 ACP.
NO, NO, NO, NO, NO, NO, NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! DO NOT EVEN TRY TO DO THIS!!!!!!!!!!!!!!
100-550 USD
250 or so
100-400 or so