The Webley Mk I is a British revolver that was introduced in 1887. It was designed by the Webley & Scott company and was notable for its solid frame and top-break mechanism, allowing for quick reloading. The revolver was chambered for the .455 Webley cartridge, which provided significant stopping power. This firearm was widely used by the British military and police forces during the late 19th and early 20th centuries. The Webley Mk I was part of a series of Webley revolvers that continued to evolve, leading to later models like the Webley Mk IV and the Webley Mk VI, which became iconic in their own right.