Colt produced New Service revolvers chambered in .455 Webley specifically for the British and Canadian military markets during WWI, supplementing Webley production that could not keep pace with British military demand. These British-contract Colt New Service revolvers are identifiable by their .455 chambering and British proof marks. They served alongside Webley Mk VI revolvers in British and Commonwealth forces throughout WWI. Type: Revolver Action: Double-Action Caliber: 455 Webley Capacity: 6 Year introduced: 1915, USA Weight: 40 oz Overall length: 10.8" Status: Discontinued Military use: Yes Intended use: military, collector, historical