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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Subtract the case size of the timepiece from your wrist measurement
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Enquire about Breitling Premier B25 Datora 42mm Watch RB2510371G1P1
Details
| Vendor | Breitling |
| Metal | 18ct Rose Gold |
Read more information regarding our Product Disclaimers.
Product Details
Paying homage to three generations of inventors – Léon, Gaston & Willy Breitling – the Premier Datora is the most refined Breitling chronograph with its complete calendar and moon-phase. As Willy Breitling said, the Premier is an “unmistakable stamp of impeccable taste”.
This latest generation of Breitling Premier chronographs brings its timeless elegance back to life, and showcases Breitling’s highest level of watchmaking thanks to a range of iconic Breitling Premier complications: the Chronograph, the Duograph and the Datora. Featuring rectangular chronograph pushers and Arabic numerals, the heritage-revived Breitling Premier Datora displays a variety of elegant design details such as grooves on the case-sides, open sapphire casebacks and vintage-inspired hands. The Datora comes in two variations: in stainless steel with a copper dial and a brown alligator strap or in 18k red gold with a silver dial and a brown alligator strap. “Datora” was a term used by Breitling in the 1940s and refers to a complete calendar chronograph displaying day, date, month and the different moon phases. The Breitling Premier Datora is powered by the cosc-certified Manufacture Caliber B25.

































