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Field, dress and GMT

Field watches favor legibility and toughness, dress watches a slim case and a clean dial, and GMT watches add a 24-hour hand to track a second time zone.

GMT hand
one turn every 24 hours, read on a 24-hour scale
Dress case
usually slim and about 36 to 40 mm, on leather

A field watch follows the military issue pattern: a high-contrast dial with clear numerals, lume, a matte case and enough water resistance for weather and washing, often 50 to 100 m. Many are 36 to 40 mm, which suits most wrists.

A dress watch is thin enough to slide under a shirt cuff, with a simple dial and a leather strap. Thickness matters as much as diameter here, so check the listed case height before you buy.

A GMT watch has an extra hand that goes around once every 24 hours and points to a 24-hour scale on the bezel or dial, so you can read home time while the main hands show local time. On a flyer GMT the local hour hand jumps in one-hour steps; on an office (caller) GMT the 24-hour hand is set on its own. Flyer GMTs suit frequent travelers; caller GMTs usually cost less.

GMT dial: the hour hand shows local time and the 24-hour hand points to home time on the 24-hour bezel24246810121416182022
24-hour hand
Lume tipped arrow. Points to home time on the bezel: 21:10.
Hour hand
Shows local time on the dial: 3:10 pm.
24-hour bezel
One full turn of the 24-hour hand per day.
The 24-hour hand goes around once a day and reads against the 24-hour bezel, so home time stays on the dial while you travel.

Common mistakes

  • Buying a dress watch by diameter without checking its thickness.
  • Assuming every GMT lets you jump the local hour hand.
  • Choosing a field watch with weak lume or low water resistance for outdoor use.

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