The 1.875" Model 637 Chief's Special Airweight is the current production exposed-hammer aluminum J-Frame with stainless cylinder. It updates the original Model 37 with stainless components and +P capability at a practical price point. Type: Revolver Action: Double-Action Caliber: 38 Special +P Capacity: 5 Year introduced: 1996, USA Weight: 15 oz Overall length: 6.3" Status: Active Intended use: Concealed Carry / Backup