Rolex · Datejust

Strap for Rolex Datejust 1601

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

Lug width20 mm
Case diameter36 mm
Reference1601
FamilyDatejust
MovementRolex caliber 1575
Year1960–1977
CaseStainless Steel or 18k Gold or Two-Tone
CrystalAcrylic
BezelFluted 18k gold or engine-turned
Water resistance100m

Recommended spring bar

Spring bars Datejust 36 steel — 20mm drilled lugs

Verified compatibility for this reference · lug 20 mm · Ø 1.8 mm · drilled lugs

All Rolex spring barsOpen →

Straps for the Datejust 1601

Selected for the 20 mm lug width · workshop selection

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The Datejust 1601, seen from the bench

The Rolex Datejust 1601, produced from 1960 to 1977, is a cornerstone of post-war Swiss watchmaking. This 36mm case model features the characteristic fluted bezel and is available in stainless steel, 18k gold, or two-tone Rolesor configuration. At its heart beats the Calibre 1575 automatic movement with a central rotor, offering approximately 48 hours of power reserve and magnetic resistance via ferromagnetic nickel shielding. The lug width is 20mm, a standard Rolex dimension allowing broad aftermarket strap compatibility.

Frequently asked questions

What is the lug width of the Rolex Datejust 1601?

The Rolex Datejust 1601 has a lug width of 20mm. This measurement should be taken as the internal distance between the two lugs using a precision calliper, and is compatible with all standard 20mm aftermarket straps available on the market.

What is the best strap for the Rolex Datejust 1601?

For the stainless steel version, a vegetable-tanned calf leather strap is the most coherent choice for formal wear, owing to the natural patina it develops over time. For gold or two-tone versions, a glossy or matte alligator strap complements the precious details. For intensive daily use, a heavy nylon NATO or vulcanised rubber strap offers durability and practicality.

How do you change the strap on a Rolex Datejust 1601?

To replace the strap on the Datejust 1601, use a forked or pin-type spring bar tool to remove the 20mm spring bars housed in the lugs. The operation should be carried out with care to avoid scratching the case: we recommend placing a soft cloth between the tool and the steel surface during the swap.

Are there aftermarket straps compatible with the Rolex Datejust 1601?

Yes. The Rolex Datejust 1601 features a standard 20mm lug width that accepts any quality aftermarket strap in that size. Milanostraps.it offers a curated selection of leather, nylon, and rubber straps specifically sized for 20mm, including spring bars and verified compatibility with original Rolex lugs.

How long does a leather strap last on a Rolex Datejust 1601?

The lifespan of a leather strap depends on the material, frequency of use, and maintenance. A quality vegetable-tanned calf strap, worn daily and conditioned with leather cream every 2–3 months, typically lasts 2–4 years. Alligator, due to the density of its scales, tends to last longer. Shell cordovan offers above-average durability. Using a deployant clasp reduces mechanical stress on the lug and extends the strap's working life.

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