Welcome to the Forum. I gather you determined the model from the stamping on the frame under the barrel. The -1 was only made from 1959-'61. If you can provide the first few digits of the SN from the bottom of the grip frame (which should begin with the letter C) we can tell you when it left the factory. We like photos too!
You will have to post the serial number. You can leave out the last couple of digits, such as C123XXX. If there are any letters they must be posted also.
Go to the "contact us" link on the S&W website and tell them you bought a used S&W Model___ Serial ____ and they will email you back with the year of production. I did this for my new Mod 36 (1969 vintage) and a K-22 Masterpiece (1983) vintage.