Tudor · Black Bay Chronograph

Strap for Heritage Black Bay Chronograph S&G / Black / Textile

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter41 mm
Reference79363N-0003 (aka: M79363N-0003)
FamilyBlack Bay Chronograph
MovementTudor caliber MT5813 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel | Chronometer
CaseYellow Gold, Stainless Steel

Recommended spring bar

Modern Tudor 22mm spring bars — factory specification

Technical match for lug width and diameter · lug 22 mm · Ø 1.8 mm

All Tudor spring barsOpen →

Straps for the Black Bay Chronograph 79363N-0003 (aka: M79363N-0003)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Black Bay Chronograph 79363N-0003 (aka: M79363N-0003), seen from the bench

The Black Bay Chronograph mounts the automatic Tudor MT5813 Calibre with column-wheel chronograph function and chronometer certification. The movement provides indication of hours, minutes, small seconds, date and chronograph. The watch features 22mm lugs for the strap.

Frequently asked questions

What is the exact lug width of the Tudor Black Bay Chronograph 79363N-0003?

The lug width of the Tudor Black Bay Chronograph 79363N-0003 is precisely 22 millimetres. This measurement refers to the distance between the case attachment pins that hold the strap bars. To verify, use a digital calliper to measure the width of the straight bar. Measurement errors may result in incompatible strap purchases (20mm, 20.5mm, 24mm), so we recommend verifying directly on your watch lugs before ordering.

Which strap is best suited for the Tudor Black Bay Chronograph 79363N-0003?

For the Tudor Black Bay Chronograph 79363N-0003, we recommend straps in noble materials that enhance the stainless steel and yellow gold bi-metal aesthetic. Alligator represents the most elegant choice for formal contexts, with regular natural grain and moisture resistance. Cognac-coloured calf leather creates chromatic harmony with the yellow gold bezel. Shell cordovan offers aesthetic evolution over time with conscious natural patina. For sporting use, FKM rubber or NATO straps maintain functionality without compromising authenticity. We advise against low-quality materials that would create undesirable contrast with the case's preciousness.

How do I change the strap on my Tudor Black Bay Chronograph 79363N-0003?

The Tudor Black Bay Chronograph 79363N-0003 uses standard spring bar attachments. Obtain a spring bar tool (strap removal lever) or consult a professional watchmaker. To proceed: insert the lever into the small hole beneath the lug, gently prise downwards to compress the pin, and extract it. Repeat on both sides. Insert the new pins into the strap, align the bars to the case lugs, and push the pins into position until they click. Avoid excessive force, which could damage the case lugs. If you are inexperienced, contact Casati Milano for professional strap changes with warranty.

Can I use an aftermarket strap on a Tudor Black Bay Chronograph 79363N-0003?

Absolutely. The Tudor Black Bay Chronograph 79363N-0003 is compatible with any 22mm strap manufactured to industrial standards. Milanostraps.it offers artisanal leather straps of exceptional quality, customisable in size, initials and stitching type. Choose from alligator, calf, shell cordovan and other materials. The important factor is ensuring that the strap bars are exactly 22mm in width and that the attachment type (pins) corresponds to the straight lugs on your case.

How long does a leather strap last on a Tudor Black Bay Chronograph 79363N-0003?

Leather strap longevity depends on material quality, frequency of wear and maintenance. A vegetable-tanned leather strap of premium quality (such as those from Casati Milano) worn daily has an average lifespan of 3–5 years before showing visible wear. With proper maintenance (periodic cleaning, hydration with natural waxes, avoiding prolonged rain exposure), durability can extend to 6–7 years. Shell cordovan, owing to its intrinsic elasticity, tends to last considerably longer. Alligator straps offer superior longevity. Milanostraps.it guarantees 18 months on all straps created at the Casati Milano atelier.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only