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 |

Cut out the length chart
Measure your wrist
Subtract the case size of the timepiece from your wrist measurement
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Enquire about Oris Big Crown Automatic Men's 38mm Watch 754 7779 4063 LS
Details
| Vendor | Oris |
| Metal | Stainless Steel |
| Case Diameter |
Product Description
Oris collaborates with Cervo Volante, using deer leather from Swiss population control programs for watch straps. Featured in the Big Crown x Cervo Volante collection, a 38 mm piece has a grey dial inspired by Swiss Alps. Cervo Volante's founders utilized deer skins from Swiss population control programs, previously wasted. They created a company for sustainably sourced, naturally tanned deer leather accessories. Now, these straps are part of Oris's collection, aligning with our mission for environmental change.
With its soft grey dial and sustainably sourced deer leather strap, the Big Crown x Cervo Volante is a beautiful reminder of our mission to bring Change for the Better.


























