Rolex
Lady-Datejust 179178— lug 13mm

The Rolex Lady-Datejust 179178 has a lug width of 13 mm. This is the standard measurement for the 26 mm case variant of the Lady-Datejust family produced between 2003 and 2015. To confirm the measurement on your specific piece, use a digital calliper to measure the internal distance between the two lugs as close to the case as possible.

For the Lady-Datejust 179178 in 18k yellow gold, a polished alligator strap — in black, bordeaux or cognac — is the most coherent choice given the model's aesthetic register. Shell cordovan in honey or tobacco tones is a distinguished alternative, developing a rich patina over time. For everyday wear, vegetable-tanned calf leather offers an excellent balance of suppleness and durability. The 13 mm lug width requires a specialist maker familiar with this specific measurement.

To replace the strap on the 179178, you will need a dedicated springbar tool or a fine-tipped lever. Remove the two springbars connecting the strap to the case lugs, working carefully to avoid scratching the polished surfaces. It is advisable to rest the watch on a soft watchmaker's mat. If you are unfamiliar with the process, it is best to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. Several artisan manufacturers produce aftermarket straps with a 13 mm lug width compatible with the Lady-Datejust 179178. Milanostraps.it offers a dedicated selection for this measurement, in alligator, calf leather, shell cordovan and other materials. It is essential to verify that the width is exactly 13 mm and that the buckle or deployant clasp is available in yellow gold or gold PVD to maintain visual consistency with the original case.

The lifespan of a leather strap depends on the material, care and frequency of use. A quality alligator strap, treated with dedicated wax or cream and stored away from moisture and direct light, can last between three and seven years while maintaining an excellent appearance. Vegetable-tanned calf leather offers a similar lifespan, with the added characteristic of developing a personal patina over time. Casati Milano provides an 18-month guarantee against manufacturing defects.