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Patek Philippe · Grand Complications

Strap for Perpetual Calendar 5940J Yellow Gold / Silver

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

Lug width

20mm
20 mm strapsAll Patek Philippe
Lug width20 mm
Case diameter37 mm
Reference5940J-001
FamilyGrand Complications
MovementPatek Philippe caliber 240 Q Day / Night Indication, Hours, Minutes, Small Seconds | Date, Leap Year, Month, Perpetual Calendar | Moonphase
CaseYellow Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

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Straps for the Grand Complications 5940J-001

Selected for the 20 mm lug width · workshop selection

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The Grand Complications 5940J-001, seen from the bench

The Patek Philippe Grand Complications ref. 5940J-001 is a perpetual calendar wristwatch in 18-karat yellow gold with a 37 mm case diameter and 20 mm lug width. It features an ivory dial with an integrated perpetual calendar requiring no adjustment until the year 2100. The watch is powered by the caliber 240 Q, a quartz thermocompensated movement displaying hours, minutes, small seconds, day, date, month, leap year, and moonphase. The yellow gold case features rounded lugs and a transparent caseback revealing the decorated movement.

Frequently asked questions

What is the lug width of the Patek Philippe Grand Complications 5940J-001?

The Patek Philippe Grand Complications ref. 5940J-001 features a lug width of 20 millimetres. This measurement is specific to the model and has been calculated by Patek Philippe to maintain harmonious proportions on the 37-millimetre case. To measure the lugs precisely, use a digital calliper positioned between the inner bases of the lugs on the yellow gold case.

Which strap is best suited for the Patek Philippe 5940J-001?

The most recommended strap for the 5940J-001 is alligator leather in medium brown tones, which contrasts elegantly with the 18-carat yellow gold. Excellent alternatives include vegetable-tanned calf (ideal for those who appreciate the patina that develops over time), black shell cordovan (for maximum durability), and dark grey FKM rubber for critical situations. The choice depends on your intended use and personal preferences regarding aesthetic evolution.

How do I change the strap on my Patek Philippe 5940J-001?

To change the strap on your 5940J-001, you must remove the lugs using specialist tools (a spring bar remover or pin pusher) without risking damage to the gold case. Given the value of this timepiece, it is strongly recommended to consult a specialised watchmaker or the Casati Milano service, which performs installation in their atelier by appointment with guarantees on the work.

Can I fit an aftermarket compatible strap on my Patek Philippe 5940J-001?

Yes, you can fit aftermarket compatible straps provided they are manufactured with a 20-millimetre lug width. On milanostraps.it you will find a selection of artisanal 20mm straps, crafted in alligator, calf, shell cordovan and rubber, all suitable for fitting to this model. However, professional installation by a specialist is recommended.

How long does a leather strap last on the Patek Philippe 5940J-001?

The lifespan of a leather strap depends on the material and frequency of use. A quality alligator strap lasts 5–7 years with daily wear. A vegetable-tanned calf strap has a similar lifespan but develops a beautiful patina over time. Shell cordovan, thanks to its inherent resistance, can exceed 8 years. Frequency of use, exposure to moisture and periodic maintenance are all determining factors. Casati Milano provides an 18-month guarantee on manufacturing defects for their straps.

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