mine is a .22 with a 4" barrel and has 2 different sets of numbers on it. 58042 and 11398. Anyone have a clue when it may have been made?
In order to make an accurate guess, you need to identify the model number, or if it's pre-58, you need to tell us whether it's an I-frame or K-frame. (S&W didn't make any J-frame .22's until they axed the I-frame in 1962.)
The serial number is on the butt of the grip frame of a J- or K-frame; on an older I-frame, it's on the front of the grip frame. Other numbers stamped elsewhere on the gun may be meaningless assembly numbers; refer earlier in this thread.