I and most other S&W fans have a copy of The Standard Catalog of Smith & Wesson (now on it's third edition) which also contains serial number/dates.
So, as Tamara said, if you provide the model number and first few digits of the serial number we can give you the DOB.
Smith Wesson 40 cal Sigma A powerful and economical pistol.
Smith & Wesson Gun History History of Smith & Wesson.
S&W became a subsidiary of Bangor-Punta from 1965-1983. Smith & Wesson was the primary distributor for most Walther firearms and accessories in the United States from 2002-2012. Smith & Wessons have been classified under the following category names - PISTOLS: LEVER ACTION, ANTIQUE, TIP-UPS, TOP-BREAKS, SINGLE SHOTS, EARLY HAND EJECTORS (Named Models), NUMBERED MODEL REVOLVERS (Modern Hand Ejectors), SEMI-AUTOS, RIFLES, and SHOTGUNS. Among the early revolvers, Tip-ups have barrels that tip up so the cylinder can be removed for loading or unloading, whereas Top-breaks have barrels & cylinders that tip down with automatic ejection.