Longines. A rare and important chrome plated Avigation Hack wristwatch Type A-7 , Ref: 27746 (Military Specification Number), Invoiced September 14, 1935
Lot 125
Longines. A rare and important chrome plated Avigation Hack wristwatch
Type A-7 , Ref: 27746 (Military Specification Number), Invoiced September 14, 1935
Sold for US$ 42,500 inc. premium

Fine Watches and Wristwatches

23 May 2017, 13:00 EDT

New York

Lot Details
Longines. A rare and important chrome plated Avigation Hack wristwatch Type A-7 , Ref: 27746 (Military Specification Number), Invoiced September 14, 1935 Longines. A rare and important chrome plated Avigation Hack wristwatch Type A-7 , Ref: 27746 (Military Specification Number), Invoiced September 14, 1935 Longines. A rare and important chrome plated Avigation Hack wristwatch Type A-7 , Ref: 27746 (Military Specification Number), Invoiced September 14, 1935
Longines. A rare and important chrome plated Avigation Hack wristwatch
Model: Type A-7 
Reference: 27746 (Military Specification Number)
Date: Invoiced September 14, 1935
Movement: Manual movement, caliber 18.72, 17 jewels, No. 5298572; hours, minutes, seconds, monopusher chronograph
Dial: Black with printed silvered Arabic numeral hour-markers, chronograph registers and constant seconds subdials, 1/5 seconds and minutes outer ring, silver Breguet and silver fils hands
Case: Snap-on hinged caseback, crown with co-axial pusher, No. 5298572 - AC-35-171
Strap/Bracelet: Tan leather strap
Buckle/Clasp: Stainless steel pin buckle
Signed: Case, dial, and movement
Size: 51mm
Accompaniments: Extract from the Longines Archives

Footnotes

  • On October 10, 1934, a US Army Air Corps seven-page dossier which described in detail the design and functions of 'Military Specification No. 27748' was released. These watches were to be designated 'Avigation' watches, a portmanteau of 'Aerial Navigation'. Seven months later, the US Army Air Corps (1926-1941) which was the predecessor to the current US Air Force, placed an order for 175 Avigation Hack Type A-7 watches from Longines through their US Agent, Wittnauer Co.

    As clearly drawn on Fig. 1 of page 4 of the highly detail-specific dossier, the Type A-7 features a right angled off-centered design, offset by 40 degrees from the vertical, a co-axial monopusher in the diamond-shaped crown, as well as large Arabic numerals, 30-minute register at 12 o'clock and constant running seconds subdial at 6 o'clock. These design elements allow pilots to read the dial, activate, stop, and restart the chronograph, as well as to always have a relative notion of position of 12 o'clock, without twisting the forearm or letting go of the yoke.

    As these watches, were manufactured specifically for the US Army Air Corps, no civilian versions of the 51mm Avigation Type A-7 were ever produced and due to the high compliance of specification number 27748, only two other manufacturers, Meylan and Gallet, could produce Type A-7 watches; watches were only produced for a short period and in limited quantities.

    Not only due to its rarity, but also owing to its distinctive and easily identifiable design, as well as the practicality inherent as a pilot's watch, the Avigation Hack Watch is the quintessential military 'tool watch'.
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