Size Guide
Choosing the perfect ring size is an essential part of the Hardy Brothers experience.
Our guide below will help you find the most accurate fit, ensuring comfort, elegance, and a seamless expression of luxury.
| Australian Size | Inside Circumference (mm) |
|---|---|
| H | 46.0 |
| H ½ | 46.6 |
| I | 47.2 |
| I ½ | 47.9 |
| J | 48.3 |
| J ½ | 49.3 |
| K | 49.6 |
| K ½ | 50.3 |
| L | 50.5 |
| L ½ | 51.5 |
| M | 51.8 |
| M ½ | 52.5 |
| N | 53.1 |
| N ½ | 53.8 |
| O | 54.5 |
| O ½ | 54.8 |
| P | 55.7 |
| P ½ | 56.4 |
| Q | 57.1 |
| Q ½ | 57.6 |
| R | 58.4 |
| R ½ | 59.1 |
For the most precise fit, we invite you to visit a Hardy Brothers boutique where our specialists will personally measure your finger and ensure your chosen piece is crafted to perfection.

Hardy Brothers uses standard Australian ring sizes.
| Australian Size | Inside Circumference(mm) |
| M 1/2 | 55.7 |
| N | 57.0 |
| N 1/2 | 58.3 |
| O | 59.6 |
| O 1/2 | 60.9 |
| P | 62.2 |
| P 1/2 | 63.5 |

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Enquire about Bremont Supermarine Automatic GMT 40mm Watch SM40-GMT-SS-GNBK-B
Details
| Vendor | Bremont |
| Metal | Stainless Steel |
| Case Diameter |
Product Details
Inspired by Iceland’s rugged landscapes and tested in the country’s unforgiving elements, the Supermarine GMT in 'Tundra' Green embodies the spirit of adventure and resilience at the heart of Bremont. This exceptional 300m water-resistant GMT watch combines bold design and premium functionality, perfect for divers, travelers, and adventurers alike.
The 'Tundra' Green edition features a striking linear gradient dial, which draws the eye to its center, complemented by a bi-directional, bi-colored 24-hour aluminium bezel. Vivid orange accents on the GMT hand and select markers add a burst of colour, enhancing readability and adding a unique visual edge. Beneath its anti-reflective sapphire crystal, the GMT boasts the latest Super-LumiNova® technology, with blue-emission luminescence on the dial indexes and green-emission luminescence on the GMT hand, ensuring optimal visibility in all lighting conditions. The Supermarine GMT is powered by a modified calibre automatic movement with a 50-hour power reserve.
Constructed from durable 904L stainless steel, the watch’s slimmer profile and ergonomic quick-release bracelet are designed for both comfort and longevity. The infinity-shaped links and micro-adjust clasp provide a refined, adaptable fit, while the option of a durable chevron rubber strap enhances versatility for any adventure. On the reverse, a closed case back engraved with the world’s oceans pays homage to Bremont’s dedication to marine exploration.
The Supermarine GMT in 'Tundra' Green is a core model in Bremont’s Supermarine collection.





























