Rolex · Day-Date 40
Strap for Rolex Day-Date 40 228349RBR-0003
The Day-Date 40 White Gold - Diamond / Black - Baguette takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Recommended spring bar
Straps for the Day-Date 40 228349RBR-0003
Selected for the 20 mm lug width · workshop selection
Matte Dark Gray Alligator Strap€195
Black Alligator Strap with Light Red Edging€149
Vintage Alligator Strap Cognac€195
Hammered Pink Strap with Ecru Stitching★ 5 · 1€98
Vintage Brown Calfskin Strap — Natural Patina★ 4.9 · 11€98
What I'm asked about the Rolex Day-Date 40 228349RBR-0003
What strap size does the Rolex Day-Date 40 228349RBR-0003 take?
The Rolex Day-Date 40 228349RBR-0003 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.
Can the strap on the Rolex Day-Date 40 228349RBR-0003 be changed?
Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.
Can I put a leather strap on the Rolex Day-Date 40 228349RBR-0003?
Yes, in 20 mm leather. On a 40 mm case a calf strap works every day; if you want something more, alligator.
Which strap do you recommend for the Rolex Day-Date 40 228349RBR-0003?
A 20 mm calf strap, for every day. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
The Day-Date 40 228349RBR-0003, seen from the bench
Frequently asked questions
Which strap material is most suitable for the Rolex Day-Date 40 in white gold?
Alligator leather with vegetable tanning represents the most aesthetically appropriate choice, as it references classical watchmaking traditions and develops natural patina over time. Calf leather, available in satin or polished finishes, guarantees superior durability for daily wear. Shell cordovan, when available, represents the pinnacle of constructive excellence. The decision depends on your wearing philosophy: static elegance, functional practicality, or intrinsic luxury.
Is an aftermarket strap compatible with the Rolex Day-Date 40 reference 228349RBR-0003?
Yes, provided it is manufactured with precisely 20mm lug width. Numerous artisanal makers produce personalised straps to these specifications. Always verify that the supplier confirms the case dimensions (40mm) and lug width (20mm) before ordering. A high-quality aftermarket strap can compete aesthetically with original Rolex solutions whilst offering personalisation and material variety.
What is the typical lifespan of a leather strap for this watch?
An alligator strap with vegetable tanning, with proper maintenance, lasts 3-5 years before aesthetic replacement becomes necessary due to surface fibre wear. Quality calf leather achieves 4-6 years under normal daily use conditions. Shell cordovan, owing to intrinsic fibre density, can exceed 8 years of service. Exposure to humidity, direct sunlight and perspiration accelerates ageing. Qualified craftsmen can regenerate aged straps through partial reconditioning interventions.
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only
Bespoke straps for Rolex, in the atelier or by video call: casatimilano.com