Introduced in 1913, the Mark I was designed with an eye for military sales, firing a semi-rimmed variant of the British 455 service cartridge. Fixed Patridge blade front and windage adjustable rear sights, with Birmingham proofs on top of the barrel and slide and the Webley "winged bullet" logo on the left side of the slide ahead of "WEBLEY & SCOTT Ltd/PISTOL SELF-LOADING .455 MARK I/1913". A repeating "'13" is present on the barrel, slide and frame, as well as a series of British "crown" and "broad arrow" proofs on multiple parts. Fitted with a matching numbered grip safety, serrated ring hammer, lanyard swivel and a pair of checkered grips.

Fine, with 70% of the original blue finish, showing areas of brown and gray patina, bright edge wear and scattered spotting and handling marks. Missing screw on right side of slide. The grips are fair, with a chip absent from the left panel, mild cracking and a few handling marks. Mechanically excellent.