Formex · Diver

Strap for Diver Quartz GMT White / 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
Reference2100.3.2012.100
FamilyDiver
MovementRonda caliber 515.24 D Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) | 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 2100.3.2012.100

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Diver 2100.3.2012.100, seen from the bench

The Formex Diver 2100.3.2012.100 is a professional-grade tool watch from independent Swiss manufacture, featuring a 46.50 mm case in titanium and steel with a 22 mm lug width. It houses a Ronda caliber 515.24 D quartz movement with hours, minutes, seconds, independent 24-hour hand, and date window—designed for simultaneous tracking of multiple time zones. The titanium-steel construction balances robustness and lightness for deep diving and demanding environments.

Frequently asked questions

What is the lug width of the Formex Diver 2100.3.2012.100?

The lug width of the Formex Diver 2100.3.2012.100 is 22 mm, a standard measurement in the mid-to-large diver category. It is measured by positioning a digital calliper between the two internal lugs of the case. This width is well-proportioned to the 46.50 mm case diameter and accommodates straps with adequate thickness without visual imbalance.

Which strap is best suited to the Formex Diver 2100.3.2012.100?

The choice depends on your usage: a natural vegetable-tanned calf leather strap is ideal if you alternate between operational and formal contexts, developing patina over time; a NATO strap in canvas or technical fabric emphasizes the tool watch character; a rubber strap is recommended if you frequently submerge the watch in water, drying quickly and maintaining flexibility even at low temperatures.

How do you change a strap on a 22 mm watch?

Changing the strap requires a spring bar removal tool or a small lever. Position the tool in the groove of the lug, apply gentle pressure to compress the spring pin, then extract the pin itself. Subsequently, insert the new strap by aligning the lug holes and reinsert the spring pin, ensuring it clicks firmly on both sides.

Are there aftermarket straps compatible with the Formex Diver 2100.3.2012.100?

Yes, any strap with a 22 mm lug width is compatible with the Formex Diver 2100.3.2012.100. Options include calf leather, alligator, shell cordovan, NATO fabric straps, technical rubber straps, and stainless steel deployante clasps. It is advisable to always verify compatibility before purchase and ensure that the strap thickness is proportionate to the case dimensions.

How long does a natural leather strap last on a diver like the Formex 2100.3.2012.100?

A high-quality natural leather strap with vegetable tanning has an average lifespan of 3-5 years of daily wear, provided it undergoes regular light maintenance. Frequent exposure to salt water or chlorine accelerates wear, as does excessive humidity. With proper drying after each water contact and occasional conditioning with specific balms, it is possible to significantly extend the longevity of the strap.

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