Strap for Black Bay 31 Stainless Steel / Blue - Diamond / Bracelet

The lug width (ansa width) of the Tudor Black Bay One 79600-0005 is 17 millimetres. This specification is particular to this model and is critical when selecting aftermarket straps. To verify it, use a digital calliper to measure the internal distance between the lug shoulders where the strap attaches. Even a slight deviation causes structural incompatibility.

The optimal choice depends on intended use. For formal wear: alligator in black or warm brown with vegetable tanning, which emphasises the delicate case geometry. For versatility: vegetable-tanned calf in grey or cognac. For sport and casual: ballistic nylon NATO in black or grey. The selection must respect the 17mm width and the chromatic contrast with the black dial and gilt hands.

The Tudor Black Bay One features fixed lugs (spring bars integral to the case). To replace: 1) Obtain a spring bar removal tool; 2) Insert the tool into the micro-gap between the lug and strap; 3) Extract the horizontal spring bar with care; 4) Remove the strap. Conversely: insert the spring bar through the holes of the new strap and secure beneath the lug with firm pressure until you hear the click. Avoid hammers or improvised tools that damage the lugs.

All straps manufactured for 17mm lugs are compatible. milanostraps.it offers a dedicated collection in alligator, calf, shell cordovan, NATO and rubber at 17mm width. Always verify the width is precisely 17mm and that total length suits your wrist (typically 70–75mm in leather, 65–80mm in NATO). Upon request, Casati Milano creates bespoke straps with personalised leather selection and hand-finished details.

The lifespan of a leather strap depends on tannage, thickness and daily wear. A quality alligator or vegetable-tanned calf worn 4–5 days weekly maintains structural integrity for 3–4 years before the first replacement. Shell cordovan achieves 5–6 years. Leather develops visible patina within 6–8 months of regular use, creating unique character. Casati Milano straps carry an 18-month warranty and are repairable: buckle replacement or stitch reinforcement extends total lifespan to 7–8 years.