A Quick Guide to The Webley MK1

Webley MK1 Air Pistol Identification Guide (1924–1964).

The Webley MK1 air pistol is one of the most iconic British air pistols ever produced. Manufactured from 1924 to 1964, the MK1 remained entirely solid steel throughout its production, never transitioning to alloy construction like later Webley models.

This guide provides a quick reference for identifying the main variations of the Webley MK1, focusing on grip styles, barrel changes, trigger adjustments, and production-era features to help collectors and owners accurately identify their pistol.

Serial Numbers and Dating the Webley MK1

As with all Webley air pistols: Pre–World War II MK1 pistols were serial-numbered, Post–World War II MK1 pistols were batch-numbered, For detailed dating information, please refer to my previous article:  “A First Guide to Webley Air Pistol Dating.”

Straight-Grip Webley MK1 (1924–1935)

From 1924 to 1935, the Webley MK1 featured what is known as a straight grip. Most straight-grip MK1s used walnut grips, typically fitted with a brass Webley medallion on the left-hand grip.

Key Design Changes During Production

The straight-grip MK1 saw relatively few changes over its production life, the most significant being: The addition of a trigger adjustment screw, Changes to the barrel top catch design.

Trigger Adjustment by Series

Series One and Two:  No trigger adjustment, Series Three, Four, and Five Trigger adjustment added, featuring two different cone-head designs.

Barrel Overhang and Piston Access (Straight Grip)

Most straight-grip MK1 pistols had: An overhanging barrel, Rear-only piston access. Sometime prior to serial number 36964, piston access became available from both ends of the cylinder, as documented by Gordon Bruce in reference to the Sixth Series.

Sloped-Grip Webley MK1 (1935–1964)

From 1935 onwards, the MK1 adopted a sloped-grip design and transitioned to Bakelite grips. Bakelite Grip Identification, Pre-war Bakelite grips no Webley logo, Post-war Bakelite grips, Webley logo embossed on both grips. Piston Access Changes, access to the piston was now via the front of the cylinder which required removal of the barrel and spring guide.

Barrel Design and Knurling Changes

1935 onwards: Barrels no longer overhung the cylinder and were cut flush with its end, reportedly for aesthetic reasons. Pre-1939:  Smooth outer barrel, 1939–1945:  Diamond knurling added for improved grip

1945–1964:  Straight knurling used until the end of production.

Important Notes on Dating and Replacement Parts

Collectors are advised not to date a Webley MK1 by removable components such as: Barrels, Grips and any

other easily interchangeable parts. Due to transitional models and widespread owner replacement, this is particularly important for the MK1, which was Webley’s most-produced air pistol.

Final Identification Tips for Collectors

While additional identifiers exist—such as patent markings and factory stamps etc—this guide focuses on the primary model changes most useful to: New Webley collectors and owners seeking to identify an inherited or recently acquired MK1.

Need Help Identifying a Webley MK1?

If you have questions about a specific Webley MK1 air pistol or need clarification on any features, feel free to get in touch. I will endeavour to assist wherever possible.