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 Breitling Classic AVI Automatic Chronograph 42mm Watch A233802A1L1X1
Details
| Vendor | Breitling |
| Metal | Stainless Steel |
Read more information regarding our Product Disclaimers.
Product Details
From brave first takeoffs to the birth of commercial air travel, Breitling’s history is inseparable from that of flight. In the 1930s, Breitling’s Huit Aviation department made its name inventing precision cockpit clocks. Two decades later, it introduced yet another novel flight instrument, this time in wearable form: the Ref. 765 AVI. That pioneering pilot’s watch provided the technical backdrop for today’s Classic AVI, a collection inspired by the rugged spirit of famed early aircraft.
The Classic AVI Curtiss P-40 Warhawk honors one of those legends. Conceived as a pursuit aircraft, the Curtiss P-40 Warhawk first flew in 1938 and quickly proved itself as a master of agility. It wasn’t just the plane’s capacity for pulling jaw-dropping turns that gave it an in-flight edge, its robust structure meant it could tolerate harsh weather conditions and even many mid-air collisions. The Warhawk’s defiant shark-mouth nose art sealed its reputation as the rebel of the skies.
As a true pilot’s watch designed to withstand the rigors of a vintage cockpit, the Classic AVI Curtiss P-40 Warhawk features large, highly legible Arabic numerals on the dial and bezel. The knurled bezel on the 42mm case provides optimal grip, even in a pilot’s gloved hands. Top-stitched calfskin straps give a nod to the seams found on classic flight gear, while the stainless-steel bracelet provides an elegant alternative. Pilots and other travelers will appreciate its legibility, wearability, and understated style. The engine of the Classic AVI is the COSC-certified Breitling Caliber 23 movement, which provides approximately 48-hours of power reserve.



























