GMT vs World Timer
GMT shows two timezones via an extra 24-hour hand (Rolex GMT-Master II THB 720,000–820,000). World Timer shows 24 timezones simultaneously via a 24-city disk (Patek 5230 THB 1.8M–2.5M, Vacheron Overseas WT THB 2.2M–2.85M). GMT suits 2-timezone travel; World Timer suits international business with multiple timezones.
GMT (Greenwich Mean Time)
Mechanism
- Extra 24-hour hand rotating once per day
- Rotating 24-hour bezel
- Main hour hand for local time
- 24-hour hand indicates home or secondary timezone
GMT types
"Caller GMT" / Office GMT
- Hour hand is jumpable — easy to adjust to local time
- 24-hour hand fixed to home time
- Suited for travellers: adjust hour hand when crossing timezones
- Example: Rolex GMT-Master II (caliber 3285), Tudor Black Bay GMT
"Flyer GMT" / True GMT
- Both hour hand and 24-hour hand independently adjustable
- Suited for pilots needing multiple timezone tracking
- Example: Rolex GMT-Master II 116710 (caliber 3186), Omega Aqua Terra Worldtimer (different mechanism)
Additional indicators
- Date function (Rolex)
- Quickset date (modern)
- Power reserve indicator (some references)
Bangkok 2026 pricing
| Reference | Model | Full Set price |
|---|---|---|
| Rolex 126710BLRO | GMT-Master II Pepsi steel | THB 650,000–820,000 |
| Rolex 126710BLNR | GMT-Master II Batman steel | 685,000–790,000 |
| Rolex 126715CHNR | GMT-Master II Root Beer rose gold | 1,650,000–1,920,000 |
| Tudor 79830RB | Black Bay GMT | 138,000–185,000 |
| Omega 220.10.43.22.10.001 | Aqua Terra Worldtimer | 285,000–355,000 |
World Timer
Mechanism
- 24-city disk around the dial — each city represents a timezone
- 24-hour disk rotates relative to city disk
- User sets their local city to 12 o'clock → all cities show correct time
- Crown push button adjusts user's local city
Patek Philippe World Time
- Caliber 240 HU (Heures Universelles)
- Patented disk system
- Example: Patek 5230, 5575, 5110
Vacheron Constantin World Time
- Caliber 2460 WT (37 cities)
- Includes 13 additional cities (30-min offset like India)
- Example: Vacheron Overseas WT 7700V, Patrimony WT
Bangkok 2026 pricing
| Reference | Model | Full Set price |
|---|---|---|
| Patek 5230G | World Time white gold | THB 1,850,000–2,450,000 |
| Patek 5230R | World Time rose gold | 2,250,000–2,850,000 |
| Patek 5110P | World Time platinum (disc.) | 3,200,000–4,200,000 |
| Vacheron 7700V | Overseas World Time steel | 2,200,000–2,850,000 |
| Vacheron 86060/000R | Patrimony World Time rose gold | 1,950,000–2,500,000 |
When to choose
GMT when:
- Travel between 2 timezones (e.g. Asia ↔ Europe)
- Want home time + local time
- Sport-watch styling for daily wear
World Timer when:
- International business — need 24 cities visible simultaneously
- Executive communicating across 5+ timezones daily
- Want dressy luxury complication
Side-by-side
| Feature | GMT Rolex | World Timer Patek |
|---|---|---|
| Entry price | THB 650,000 | THB 1,850,000 |
| Caliber complexity | 220 parts (3285) | 280 parts (240 HU) |
| Service cost | THB 28,000 | THB 85,000 |
| Service interval | 7–10 years | 5–7 years |
| Resale liquidity | Very high | Medium |
| Collector market | Wide | Niche specialist |
Buyer guidance
Pick GMT if:
- Daily use + want easy resale
- Budget <THB 1M
- Want sport-watch styling
- Use 2 timezones (home + travel destination)
Pick World Timer if:
- International business level
- Budget >THB 1.8M
- Like distinctive luxury complication
- Value craftsmanship of Patek/Vacheron disk system
Resale impact
GMT functioning normally
- Baseline
GMT 24-hour hand not rotating
- -8 to -12% (Service Centre repairs)
World Timer disk system issues
- -12 to -20% (service complex, parts expensive)
Both: crown function missing
- -6 to -10%
Send GMT/World Timer photos via LINE — we test function and quote accurately.
Sources: Rolex GMT-Master II technical specifications · Patek Philippe Caliber 240 HU documentation · Vacheron Constantin Overseas WT user manual · WatchCharts GMT/WT comparison data