Strap for Seamaster Diver 300M Automatic 41.5 Chronograph Titanium / Yellow Gold / Blue / Bracelet

The lug width of the Seamaster Diver 300M 2297.80.00 is 20 millimetres. This measurement is taken between the two extremities of the lugs (the horizontal attachments of the case) and determines the space available for housing a replacement strap. The 20mm is a consolidated standard for this model and allows the use of a wide range of handcrafted straps in both leather and synthetic materials.

For the Seamaster Diver 300M 2297.80.00 we recommend an alligator in a dark shade (dark brown, black or burgundy) to elegantly contrast with the bi-metal case in titanium and yellow gold. Shell cordovan in mahogany brown is ideal for those who desire a more jewelled appearance, while calf leather in cognac or brown is perfect for those who appreciate the natural patina that develops over time. For frequent water use, an FKM rubber strap guarantees resistance to moisture.

To change the strap you need to remove the lug bar (the horizontal bar that joins the two case attachments). Use a proper tool (T-shaped or cross-shaped) to push outward the screw that secures the lug bar, or, if there is a simple pin, extract it laterally. Once the lug bar is removed, the old strap disengages easily. Insert the new strap into the case and reinsert the lug bar, ensuring it is perfectly aligned. If you do not have the appropriate tools, we recommend contacting a professional watchmaker or the Casati Milano atelier for a precise replacement.

Yes, any strap with a lug width of 20 millimetres is compatible with the Seamaster Diver 300M 2297.80.00. Compatibility depends exclusively on the width measured between the two case attachments. Milano Straps handcrafted straps are made to this specific measurement and available in a wide selection of fine leathers, finishes and customisations.

A natural leather strap, if subjected to regular use on a sports watch like the Seamaster Diver 300M, has a typical lifespan of 3-5 years before requiring replacement. Durability varies depending on the material (alligator and cordovan are more durable than standard calf), frequency of use, water exposure and daily care. Straps made with fine leathers by Milano Straps include an 18-month warranty. If you wear the watch in frequent aquatic environments, we recommend an FKM rubber strap that resists moisture better, or alternating multiple leather straps to distribute wear.