Rolex · Day-Date 40

Strap for Day-Date 40 White Gold / Green - Roman

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

Lug width20 mm
Case diameter40 mm
Reference228239-0033
FamilyDay-Date 40
MovementRolex caliber 3255 hours, minutes, seconds | date, day | chronometer
Year2016
CaseWhite Gold

Recommended spring bar

Spring bars Rolex Daytona 116520 — 20mm steel

Technical match for lug width and diameter · lug 20 mm · Ø 1.5 mm · closed lugs

All Rolex spring barsOpen →

Straps for the Day-Date 40 228239-0033

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Day-Date 40 228239-0033, seen from the bench

The Rolex Day-Date 40 ref. 228239-0033 features a 40 mm white gold case and the Rolex 3255 caliber movement. Introduced in 1956, this model displays the day of the week and date simultaneously. The 3255 movement offers 70-hour power reserve and COSC chronometer certification with ±2/+2 second daily tolerance. The case includes a fluted bezel, rounded lugs, and the President bracelet signature. Lug width is 20 mm, compatible with aftermarket straps. The silicon Syloxi balance wheel resists magnetic interference, while the Parachrom hairspring regulator ensures chronometric stability.

Frequently asked questions

What is the lug width of the Rolex Day-Date 40 228239-0033?

The Rolex Day-Date 40 ref. 228239-0033 has a lug width of 20 mm. This measurement is taken between the two lugs at the strap attachment point and is compatible with all 20 mm aftermarket straps, ideally tapered to 16 or 18 mm at the buckle end.

What is the best strap for the Rolex Day-Date 40 228239-0033?

For the Day-Date 40 228239-0033 in white gold, an alligator strap with vegetable tanning is the classic pairing, as its structured grain complements the fluted bezel. Shell cordovan is the preferred alternative for those who value compactness and a developing patina over time. A deployant clasp in white gold or silver completes the metallic coherence of the ensemble.

How do you change the strap on a Rolex Day-Date 40?

The strap on a Rolex Day-Date 40 is removed using a dedicated lug screwdriver for screw-type lugs, or a spring bar tool for spring bar models. It is advisable to consult a qualified watchmaker to avoid scratching the white gold case. Compatible aftermarket straps are fitted using the same procedure, ensuring that the lug width matches the 20 mm specification of this reference.

Are there aftermarket straps compatible with the Rolex Day-Date 40 228239-0033?

Yes, the aftermarket offers a wide selection of straps compatible with the 20 mm lug width of the Day-Date 40 228239-0033. Milanostraps.it provides handcrafted options in alligator, calf leather, shell cordovan and rubber, made with carefully selected materials and hand-stitched finishing, available both online and as bespoke commissions through the Casati Milano atelier.

How long does a leather strap last on a Rolex Day-Date 40?

The lifespan of a leather strap depends on the quality of the tanning, the thickness of the hide and the conditions of use. A high-grade alligator or shell cordovan strap with vegetable tanning can last between three and six years with regular maintenance: drying after moisture exposure, periodic application of a neutral conditioner and rotation with other straps to reduce daily 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.

Request an appointment →

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