Longines C.O.S.D. 2340 "Tuna Can" for British Paratroopers in World War II

A RARE GENTLEMAN'S BRITISH MILITARY LONGINES PARATROOPERS WRIST WATCH Switzerland around 1945 D: White dial with 12 & 24 hour Arabic numerals, outer tracking, military arrow. M: Manual wind movement signed Longines & numbered, calibre 10.68N. C: Military nickel plated & steel "tuna can" case with fixed bars, Combined Operations stores Depot issue markings C.O.S.D. 2340, military issue markings ^ 2188, case diameter measures approx. 36mm. S: hand made vintage leather NATO strap.

CONDITION:

Dial: original dial in good condition with some  signs of age.
Movement: working fine
Case: in good condition  and wear due to general use.

DESCRIPTION:

The COSD is one of the rarer of military Longines, it shows and a very distinctive and contemporary “tuna-can” design, a large crown and oversized fixed bars between the lugs.
The Reference is 2340, the case is made of brass and then heavily nickel-plated, it bears the serial number 2188, the statutory Broadarrow marking of British issued military timepieces as well as the C.O.S.D. marking.The back is also brass, an unusual construction solution, as usually brass-cased watches have stainless-steel backs.

Some measurements:
Case Diameter:  35.6 mm
case length, lug to lug: 46 mm
crown: 7.28 mm
lugs width: 18.3 mm

The movement is a classic Longines cal. 12.68N with center sweep-seconds. It is an early generation movement with no shock-proof device on the balance-wheel. The other parts of the watch were produced locally under license from Longines.
The crown is also made on nickeled brass, it is quite large, 7.28mm diameter.
The dial is a flat one with the classical three feet. It is classically printed, the original color should have been whitish, with black arabic numerals, a red 24 hours inner scale and the broad-arrow. The indexes have no trace of there being – or there having been – any luminescent material.
The hands are steel, center-sweep-seconds hand is very distinctive with a bevel-tail and a diamond-shaped point.
Glass is Plexi.

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