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Patek Philippe · Grand Complications

Strap for Patek Philippe Grand Complications 3970ER-012

The Perpetual Calendar Chronograph 3970 Rose Gold takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

19mm
19 mm strapsAll Patek Philippe
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Lug width19 mm
Case diameter36 mm
Reference3970ER-012
FamilyGrand Complications
MovementPatek Philippe caliber CH 27-70 Q Hours, Minutes, Small seconds, Day / Night Indication | Date, Day, Leap year, Month, Perpetual calendar | Chronograph, Column wheel
Year1986 - 2004
CaseRed 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 19 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Perpetual Calendar Chronograph 3970 Rose Gold — watch

Straps for the Grand Complications 3970ER-012

Selected for the 19 mm lug width · workshop selection

All 19 mm straps →

What I'm asked about the Patek Philippe Grand Complications 3970ER-012

What strap size does the Patek Philippe Grand Complications 3970ER-012 take?

The Patek Philippe Grand Complications 3970ER-012 needs 19 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 3970ER-012 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 3970ER-012?

Yes, in 19 mm leather. On a 36 mm chronograph I like box calf: it holds its shape and carries a substantial case.

Which strap do you recommend for the Patek Philippe Grand Complications 3970ER-012?

A 19 mm box calf. You'll find it ready in the 19 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare 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.

Request an appointment →

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

The atelier's website: casatimilano.com