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IWC · GST Aquatimer

Strap for IWC GST Aquatimer IW3756-14

The GST Perpetual Calendar Stainless Steel / Black / Italian takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

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Lug width

21mm
21 mm strapsAll IWC
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Lug width21 mm
Case diameter43 mm
ReferenceIW3756-14 (aka: IW375614)
FamilyGST Aquatimer
MovementIWC caliber 79261 Hours, Minutes, Small seconds | Date, Day, Month, Perpetual calendar, Year indicator | Chronograph
Year2001 - 2004
CaseStainless Steel

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 21 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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GST Perpetual Calendar Stainless Steel / Black / Italian — watch

Straps for the GST Aquatimer IW3756-14

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

What length do I need?

Measure your wrist with a tailor's tape or a piece of string, comfortably snug.

Wrist circumferenceLength (long side / short side)
15.0–16.4 cm120 / 70 mm
16.5–17.8 cm125 / 75 mm
17.9–19.0 cm130 / 80 mm
19.1–20.3 cm135 / 85 mm
20.4–21.6 cm140 / 85 mm
21.7–22.9 cm145 / 90 mm

The ready-to-wear strap is 115 × 75 mm. For a smaller or larger wrist I make it in the right length: order your length.

What I'm asked about the IWC GST Aquatimer IW3756-14

What strap size does the IWC GST Aquatimer IW3756-14 take?

The IWC GST Aquatimer IW3756-14 needs 21 mm between the lugs, usually 18 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the IWC GST Aquatimer IW3756-14 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 IWC GST Aquatimer IW3756-14?

Yes, in 21 mm leather, as long as you don't wear it in the water: leather doesn't like the sea or the pool. For days in the water, rubber. On a 43 mm diver I go for a full-thickness strap, not a thin one. I don't keep rubber ready in 21 mm: write to me and I'll make it.

Which strap do you recommend for the IWC GST Aquatimer IW3756-14?

Rubber if you wear it in the water; otherwise a 21 mm calf strap, full thickness. You'll find it ready in the 21 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.

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

Bespoke straps for IWC, in the atelier or by video call: casatimilano.com

Updated on · by Antonio Zichichi