Dirty Dozen Military Watches

Movement & mechanism

• Manual-wind lever movements meeting the W.W.W. specification for accuracy and shock resistance, varying in calibre between the twelve contracted manufacturers
• Common specification dial: black dial, luminous Arabic numerals, railway (24-hour) minute track and a subsidiary seconds dial
• Screw or snap case backs stamped with military issue markings

Identification

• Broad arrow ('pheon') government property mark stamped on the case back
• 'W.W.W.' marking together with a military store reference number on the case back
• Common dial layout across all twelve makers despite differing movement calibres and case suppliers
• Maker name on the dial identifying which of the twelve contracted firms supplied that example

Terminology

• W.W.W. — Watch, Wrist, Waterproof, the British Ministry of Defence specification these watches were built to
• Dirty Dozen — the informal, retrospective collectors' name for the twelve contracted manufacturers, not a period term
• Broad arrow — the British government ownership mark stamped on issued equipment

Known variations

• Examples from each of the twelve contracted manufacturers, which differed in movement calibre and case supplier while sharing the specification dial

Pocket-watch ancestry

The W.W.W. specification continues a long British tradition of military timepiece procurement to a written specification that began with pocket watches; the twelve-maker wristwatch contract of 1945 applies the same procurement logic and legibility requirements to the wrist-worn form that had by then become standard general-service issue.

Collecting notes

One of the most actively collected military watch categories; because case backs, dials and movements were sometimes separated or swapped during decades of service and later trading, matching original case, dial and movement configuration to published contract records is central to authentication, and case-back markings are a frequent target of forgery.

Sources & references

1. National archive procurement records vary in completeness and are not fully reproduced here.

Where sources disagree, the disagreement is stated rather than resolved silently.