Strap for Submariner Date 16613 Blue Tritium

The lug width is 20 millimetres. This measurement is specific to the Submariner 16613 and represents the engineering balance between case geometry and aesthetic proportion. It must be measured precisely between the two anchor pins that pass through the case at its extremities. A narrower or wider strap will not fit correctly and risks damaging both the case and the strap itself.

Dark brown alligator (tête de maure, chocolate, or cognac) is the most coherent choice for the yellow gold and steel two-tone finish of this model. The polished texture of alligator captures the reflections of gold and creates visual continuity. Prestigious alternatives include shell cordovan, which develops a rich patina over time, and vegetable-tanned calf for a vintage effect. For water applications, FKM rubber is mandatory.

The procedure requires a specialist tool: a spring bar removal tool. Position the watch with the lugs facing towards you. Insert the tool into the small slot beneath the lug pin, applying gentle pressure to compress the internal spring. The pin will retract slightly, allowing you to extract it. Repeat for the second pin. Insert the new pins into the replacement strap and position them in the watch lugs, ensuring they click fully into place. For professional results, Casati Milano offers a strap replacement service.

Yes, provided the lug width is exactly 20mm. All straps with a 20mm lug width are compatible, regardless of manufacturer. However, construction quality varies significantly: an artisanal strap with vegetable tanning, alligator, or shell cordovan, such as those from Casati Milano, guarantees 5-7 years of service and develops a natural patina, whilst mass-produced entry-level straps may deteriorate within 12-18 months. The choice of material and craftsmanship determines the user experience and case preservation.

An artisanal alligator or shell cordovan strap typically lasts 5-7 years with moderate daily use, developing characteristic patina. Vegetable-tanned calf, being more absorbent, has similar longevity but requires more maintenance. Leather naturally absorbs moisture and skin oils, and wears at points of maximum flexion (near the pins and beneath the wrist). Casati Milano provides an 18-month warranty on manufacturing defects and offers restoration and rejuvenation services.