While not comprehensive, certain prefixes can give you a rough era: Smith & Wesson Historical Foundation
In October 1980, Smith & Wesson unified its serial numbering system across all models to satisfy computerization and modern manufacturing tracking. smith and wesson revolver serial numbers database
Since no official "point-and-click" database exists, collectors rely on these definitive sources: Link/Source Standard Catalog of S&W While not comprehensive, certain prefixes can give you