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

The lug width of the Tudor Classic Ref. 21013-0005 is 20 millimetres. This measurement refers to the distance between the upper and lower lugs of the case, and is the fundamental parameter for purchasing a compatible strap. To verify manually, place a ruler on the case: the space between the two lugs must measure exactly 20 mm.

For the 21013-0005 in yellow gold and steel, we recommend a medium brown alligator strap or a high-quality calf leather. Alligator enhances the natural grain and amplifies the bi-chromatic contrast of the case; calf offers a more sober and neutral base. If you desire a more versatile and casual style, a NATO strap in grey or anthracite tones is excellent.

The strap is changed using a spring bar remover: position it under the case lug, press gently to release the spring, then extract the lug. Repeat on the other side. When mounting the new strap, ensure that both springs are firmly engaged within the lugs. If you are not experienced, consult a professional watchmaker.

Yes, any strap with a 20 mm lug width is compatible with the 21013-0005. High-quality artisanal aftermarket straps (such as those from milanostraps.it) offer an excellent alternative to original straps: they maintain the integrity of the case entirely and often enhance the aesthetic versatility of the watch.

Durability depends on usage and material quality. A high-quality artisanal alligator or aniline-dyed calf strap typically lasts 3–5 years under daily-wear conditions. If exposed to frequent moisture, durability may be reduced. With proper care (regular cleaning and occasional conditioning), longevity extends significantly. Casati Milano straps include an 18-month warranty.