Formex · Diver

Strap for Diver Quartz GMT White / Rubber

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
Reference2100.3.2012.930
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 2100.3.2012.930

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Diver 2100.3.2012.930, seen from the bench

The Formex Diver reference 2100.3.2012.930 is powered by the Ronda 515.24 D quartz movement with hour, minute, second and adjustable GMT hand indications. The watch features a date function and a 22mm lug width. The movement provides a second time zone indication through the 24-hour hand.

Frequently asked questions

What is the lug width of the Formex Diver 2100.3.2012.930?

The lug width of the Formex Diver 2100.3.2012.930 is 22mm. This measurement represents the internal distance between the spring bars. Verifying this specification before purchasing an aftermarket strap is essential to ensure compatibility and correct installation.

Which strap is best suited for the Formex Diver 2100.3.2012.930?

For the Formex Diver 2100.3.2012.930, we recommend alligator leather in vegetable-tanned finishes in dark brown or black tones, alternatively vulcanised rubber with fine grain texture in dark grey. These materials emphasise the tool-watch character of the case without competing chromatically. A robust NATO strap represents the practical alternative for daily wear.

How do I change the strap on my Formex Diver 2100.3.2012.930?

First remove the spring bars using a spring bar tool (small fork-shaped implement). Locate the horizontal pins inside the case: push towards the centre to release the old strap. Insert the new 22mm strap aligning the holes and reposition the spring bars with inverse movement, ensuring they lock firmly into place.

Can I use an aftermarket strap on this watch?

Yes, any strap with a 22mm lug width is compatible with the Formex Diver 2100.3.2012.930. Ensure the strap thickness does not exceed 4.5–5mm to prevent friction on the case. High-quality artisanal leather, NATO and rubber straps guarantee superior longevity and aesthetics compared to generic solutions.

How long does an alligator leather strap last on the Formex Diver 2100.3.2012.930?

An alligator strap in vegetable-tanned leather, with regular use and proper maintenance, lasts 3–5 years before requiring replacement. Factors such as humidity, sun exposure and perspiration accelerate ageing. Alligator develops a natural patina over time that enhances vintage character. Periodic replacement is recommended to maintain hygiene and structural integrity.

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