Strap for Black Bay 31 S&G - Diamond / Anthracite - Diamond / Bracelet

The lug width of the Tudor Black Bay One 79613-0003 is 16mm. This dimension is specific to this compact model and requires straps specifically manufactured for this width. Always verify the measurement with a digital calliper before ordering, as the manufacturing tolerance is tight: compatible straps have an effective width between 15.8 and 16.2mm.

For the Tudor Black Bay One 79613-0003, we recommend three options depending on use: black alligator for formal contexts (enhances yellow gold), vegetable-tanned calf for daily wear (develops natural patina), or woven NATO for sport and versatility. Your choice should reflect how you intend to wear the watch. Honey-brown alligator creates natural colour harmony with the gold, while dark blue calf permits more contemporary styling.

Changing the strap on the 79613-0003 requires a spring bar tool. Position the watch on a table with gentle movement: insert the tool into the lateral gap between the spring bar and the case, lift slightly to release the bar from its seat on the lower lug. Repeat on the upper lug. Ensure your new strap has passants compatible with the 16mm lug width, and reinsert the spring bars with smooth motion until the click indicates closure.

Yes, provided the aftermarket strap is manufactured for 16mm lug width. Milanostraps offers a complete collection of artisanal 16mm straps compatible with the 79613-0003: alligator, calf, shell cordovan, rubber, and NATO. Each strap is available in personalised lengths and permits choice of stitching thread. The Casati Milano atelier can furthermore create bespoke straps using specific leathers and dedicated finishes.

A quality leather strap on a daily-wear Tudor typically lasts 18–36 months, depending on the tanning method and frequency of use. Vegetable tanning, whilst visibly ageing, maintains structural integrity longer (36+ months). Alligator and shell cordovan, being denser, easily achieve 24–36 months. Factors such as humidity, direct sun exposure, and skin perspiration influence longevity. Milanostraps offers an 18-month warranty on all artisanal straps.