1-Minute Watch Lesson #042 – Why Does a GMT Hand Move Half as Fast?

Your GMT hand is not meant to follow the normal hour hand. A conventional 24-hour GMT hand makes one lap per day; the normal hour hand makes two. Their separation alone does not prove a fault.

Editorial illustration of a red GMT hand pointing to 18 on a 24-hour scale
Simplified editorial illustration: 18 means 6 p.m. on this 24-hour scale.

1. Read the right numbers. Use the 24-hour scale: 06 means 6 a.m.; 18 means 6 p.m.; 24 marks midnight. A 60-minute dive bezel is a different scale.

2. Try the same-zone example. With 24 at the top, 06 sits right and 18 sits left. At 6 p.m., a GMT hand set to the same zone points left, while the normal hour hand points down to six. Read minutes from the minute hand.

3. Check the setup. Seiko’s 4R34 instructions illustrate AM/PM and dual-time use. A rotated 24-hour bezel changes the reference; follow your watch’s manual.

Watcher Insight: read the scale before judging the hand. For setting differences, see caller versus traveller GMT.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top