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The Smith & Wesson SW9F is a first-generation 9mm full-size pistol from the 1990s Sigma series. It features a 4.5-inch barrel, striker-fired DAO action, and a 16+1 or 17+1 round capacity, featuring a polymer frame, blued slide, and 3-dot sights. The SW9F was manufactured between roughly 1994 and 1997. 
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Key Specifications
Action: Double Action Only (DAO) Striker-Fired
Caliber: 9x19mm Parabellum
Capacity: 16+1 or 17+1 rounds
Barrel Length: 4.5 inches
Overall Length: 7.75 inches
Weight (Unloaded): Approximately 26 oz
Frame: Black Polymer
Slide Finish: Blued Steel
Sights: 3-Dot Fixed
Grip Angle: Similar to Colt 1911A1 
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General Features
Series: First Generation Sigma (designated 'F' for Full size)
Function: Short-recoil system
Usage: Duty, service pistol