Boderry
Boderry Admiral GMT (Bronze, Blue)
Last updated September 11, 2026
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A 200m bronze GMT dive watch with a Seiko NH34 movement and a two-tone bezel — the range-topper at $399.
Best for
Someone who wants a characterful bronze GMT diver that ages and patinas — a standout gift rather than a safe one.
Overview
The Admiral GMT Bronze is the most ambitious watch in this group. The case is CuSn8 tin bronze, a material that develops its own patina over time, and it houses a Seiko NH34 automatic with a true GMT hand for tracking a second time zone. It is a proper 200m (20 ATM) diver with an anti-reflective sapphire crystal and a two-tone aluminium bezel, on an FKM rubber strap with a steel folding clasp. It is heavier and more of a statement than the titanium Admiral, which is rather the point.
The good
- Patina-developing CuSn8 bronze case
- True GMT second-time-zone hand (Seiko NH34)
- 200m (20 ATM) water resistance
- Anti-reflective sapphire crystal
- FKM rubber strap with a folding clasp
The trade-offs
- Bronze patinas — a feature, but not to everyone’s taste
- Heavier than the titanium models
- Range-topping price of the group
Specifications
- Movement
- Seiko NH34 (automatic GMT, date, hacking)
- Case diameter
- 40 mm
- Case thickness
- 13 mm
- Case material
- CuSn8 tin bronze
- Crystal
- Sapphire (anti-reflective)
- Water resistance
- 20 ATM (200m)
- Strap
- FKM rubber (20mm)
- Dial
- Blue
FAQs
Will the bronze case change colour?
Yes — CuSn8 bronze develops a patina over time as it reacts with air and skin. Many owners like the aged look; if you prefer it bright, it can be gently polished back.
What does the GMT hand do?
The Seiko NH34 adds a fourth, GMT hand that tracks a second time zone on the bezel or a 24-hour scale — useful for travel or keeping home time.
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