What a Black Bay GMT 79830RB Clears for in Bangkok — June 2026
Tudor Black Bay GMT launched at Baselworld 2018 with the Pepsi bezel (red-blue) using MT5652 in-house caliber — Tudor's first in-house GMT movement.
Thai Watch Market drawn from our work in Bangkok's pre-owned market Jan–May 2026:
- Low ฿138,000 — 2019–2020 references, worn, no box
- Median ฿152,000 — Full-set 2022–2023 with TH warranty
- High ฿172,000 — NOS 2024+ with stickers
Black Bay GMT vs Rolex GMT-Master II
The most-asked question for Tudor GMT in Thailand:
| Feature | Tudor BB GMT 79830RB | Rolex GMT-Master II 126710BLRO |
|---|---|---|
| Size | 41mm | 40mm |
| Thickness | 14.6mm | 11.9mm |
| Water resistance | 200m | 100m |
| Caliber | MT5652 (70h) | 3285 (70h) |
| Material | 316L steel | 904L Oystersteel |
| Bezel | Aluminium insert | Cerachrom |
| Crown adjustment | True GMT (independent hour) | True GMT (independent hour) |
| MSRP 2026 | ฿172,000 | ฿525,000 |
| Used median | ฿152,000 | ฿745,000 |
Tudor GMT is the option for Pepsi GMT buyers on budget. Used Tudor trades at roughly one-fifth the Rolex GMT-Master II Pepsi price.
Seller Pattern — Why Black Bay GMTs Come to Market
From our transactions:
- 41% selling to upgrade to Rolex GMT-Master II 126710BLRO
- 28% selling because 14.6mm thickness becomes uncomfortable long-term
- 18% Tudor duplicates — sellers with multiple Tudors offloading the one worn least
- 13% needing cash
What Bangkok Dealers Pay
| Scenario | Seller payout (2023 full set) |
|---|---|
| Full-set, TH warranty | ฿125,000–฿135,000 |
| Full-set, overseas warranty | ฿118,000–฿125,000 |
| No box, papers | ฿105,000–฿115,000 |
| Loose | ฿95,000–฿105,000 |
Dealers pay 78–82% — similar to Pelagos and BB58.
79830RB Authenticity Checkpoints
- MT5652 caliber — in-house with COSC certification and silicon hairspring
- Pepsi bezel — aluminium insert (not ceramic); Tudor deliberately uses aluminium for heritage feel. Bezel has matte finish distinct from Rolex GMT-Master II
- Snowflake hands — Tudor signature
- Riveted bracelet — same as BB58 but wider (41mm case)
- True GMT mechanism — hour hand jumps one hour at a time (true GMT). Many fakes use "office GMT" where the GMT hand is adjusted instead
Bangkok Buyer Quotes
From 9 buyers interviewed:
- "I want Pepsi GMT but Rolex is out of budget"
- "I travel often and need true GMT under ฿150k"
- "Tudor has in-house caliber and COSC — I don't need to go to Rolex"
Price Movement 2022–2026
- March 2022 — ฿172,000 (peak during Submariner waitlist crunch)
- December 2023 — ฿158,000
- December 2024 — ฿155,000
- June 2025 — ฿153,000
- June 2026 — ฿152,000
Down 11.6% from peak; stable since late 2023.
Get a LINE quote for your Black Bay GMT →
Data sources:
- Thai Watch Market database Jan–May 2026, from our work in Bangkok's pre-owned market- WatchCharts Black Bay GMT
- Tudor Thailand documentation 2026