Patek Philippe · Grand Complications

Strap for Patek Philippe Grand Complications 3940J-025

The Perpetual Calendar 3940 Yellow Gold / Painted Roman takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

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Lug width18 mm
Case diameter36 mm
Reference3940J-025
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

Standard spring bar · length 18 mm · Ø 1.8 mm double flange · industry standard, no brand part number

Perpetual Calendar 3940 Yellow Gold / Painted Roman — watch

What I'm asked about the Patek Philippe Grand Complications 3940J-025

What strap size does the Patek Philippe Grand Complications 3940J-025 take?

The Patek Philippe Grand Complications 3940J-025 needs 18 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 Patek Philippe Grand Complications 3940J-025 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 Patek Philippe Grand Complications 3940J-025?

Yes, in 18 mm leather. On a 36 mm case a calf strap works every day; if you want something more, alligator.

Which strap do you recommend for the Patek Philippe Grand Complications 3940J-025?

A 18 mm calf strap, for every day. You'll find it ready in the 18 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

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

The atelier's website: casatimilano.com