Formex · Diver

Strap for Diver Automatic Black / Bracelet

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter47 mm
Reference2100.1.7020.100
FamilyDiver
MovementETA caliber 2824-2 Hours, Minutes, Seconds | Date
CaseTitanium, Stainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the Diver 2100.1.7020.100

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Diver 2100.1.7020.100, seen from the bench

The Formex Diver 2100.1.7020.100 is a professional tool watch featuring the ETA 2824-2 automatic movement. The 46.50mm case combines titanium and stainless steel construction. It features a unidirectional bezel, date window, and lume-filled indices designed for readability in critical conditions. The 22mm lug width accommodates professional straps and maintains proportional balance between case and wrist.

Frequently asked questions

What is the lug width of the Formex Diver 2100.1.7020.100?

The Formex Diver 2100.1.7020.100 features a lug width of 22mm, measured perpendicularly at the point of contact between the case lug and the strap. This measurement is standardised and allows compatibility with any 22mm aftermarket strap.

Which strap is most suitable for the Formex Diver 2100.1.7020.100?

Selection depends on primary use. For intensive water environments, a technical rubber or NATO strap ensures rapid drying and absence of swelling. For daily wear, alligator leather or vegetable-tanned calf offers elegance and natural patina development. For expeditions, a black NATO strap provides versatility and rapid emergency changes.

How do I change the strap on the Formex Diver 2100.1.7020.100?

Strap changes are accomplished via the lug pins, which are removable manually or with dedicated tools (spring bar tool). Position the watch on a soft cloth, insert the tool between the lug and pin, apply gentle compression to the internal lug shoulder, and the pin slides out without case damage. Repeat on the opposite side, then install the new strap sequentially.

Can I use an aftermarket 22mm strap on this Formex Diver?

Yes, without restrictions. Any strap with a 22mm lug width is compatible with the Formex Diver 2100.1.7020.100. Milano Straps offers complete 22mm compatibility in natural leather, alligator, shell cordovan, NATO, technical rubber, and canvas fabrics, all ready for immediate use.

How long does a leather strap last on the Formex Diver 2100.1.7020.100?

Longevity depends on tanning method and material. Vegetable-tanned calf lasts 3–5 years in daily wear, with potential patina regeneration. Alligator resists 5–7 years, with aesthetic improvement through ageing. NATO persists 7–10 years. Frequent exposure to humidity and salt water reduces lifespan but accelerates natural patina development in organic materials.

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