Tudor · Classic

Strap for Classic 38 Stainless Steel / Yellow Gold / Fluted / Black / Bracelet

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter38 mm
Reference21013-0003 (aka: M21013-0003)
FamilyClassic
MovementETA caliber 2824-2 Hours, Minutes, Seconds | Date
CaseYellow Gold, Stainless Steel

Spring bar

Spring bars for Tudor

The right category for this model · choose the 20 mm size

Straps for the Classic 21013-0003 (aka: M21013-0003)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Classic 21013-0003 (aka: M21013-0003), seen from the bench

The Tudor Classic 21013-0003 is a 38mm two-tone stainless steel and yellow gold case watch featuring a clean, dress-sport design from the modern reinterpretation of a Geneva classic. Powered by the ETA 2824-2 automatic calibre with approximately 38 hours of power reserve, it displays hours, minutes, seconds and date. The 20mm lug width is determined by the case architecture and designed for proportionate straps without excess or undersizing. Water resistant to 100 metres, the watch combines applied indices, Mercedes hands and three-window date on a legible dial.

Frequently asked questions

What is the lug width of the Tudor Classic 21013-0003?

The lug width of the Tudor Classic 21013-0003 is 20mm. This measurement is taken as the internal distance between the terminal lugs of the case and is essential for selecting a compatible strap. Any strap mounted on this watch must have precisely this dimension to ensure perfect fit and secure attachment.

Which strap is best suited to the Tudor Classic 21013-0003?

The finest strap for the Tudor Classic 21013-0003 is alligator in black or cognac brown, which enhances the yellow gold bicolour case beautifully. As an alternative, superior-quality vegetable-tanned calfskin preserves the formal character whilst offering exceptional longevity. For more casual applications, anthracite-grey NATO provides versatility without compromising the watch's dress-sport identity.

How do you change the strap on a Tudor Classic 21013-0003?

Changing the strap requires a dedicated tool: the spring bar tool. Insert the forked end of the tool into one of the case's lateral pins, then press gently downward to retract the pin. Once retracted, withdraw the old strap and insert the new one, ensuring the pin returns correctly to its locked position. Always verify that the pin is fully secured before wearing the watch.

Is an aftermarket strap compatible with the Tudor Classic 21013-0003?

Yes, any aftermarket strap with a 20mm lug width is compatible, provided the strap width is exactly 20mm and the pin diameter meets standard specifications. It is advisable to verify dimensions carefully: straps from specialist artisans (such as Milano Straps) guarantee precise tolerances and superior construction quality compared to generic alternatives.

How long does a leather strap last on the Tudor Classic 21013-0003?

Leather strap longevity depends on material type and usage patterns. High-quality alligator lasts 5–7 years with daily wear and standard maintenance. Vegetable-tanned calfskin typically lasts 3–5 years. Shell cordovan, being exceptionally durable, can last over 10 years. Natural leather ageing causes gradual thinning and eventual replacement necessity. Factors such as perspiration, humidity, and sun exposure accelerate wear.

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