Formex · Essence

Strap for Essence Leggera Automatic Chronometer Cool Grey / 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 diameter43 mm
Reference0330.4.6309.910
FamilyEssence
MovementSwiss Technology Production caliber STP1-11 Hours, Minutes, Seconds | Date
CaseTitanium, Ceramic, Carbon

Spring bar

Swiss Standard universal spring bars

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

Straps for the Essence 0330.4.6309.910

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Essence 0330.4.6309.910, seen from the bench

The Formex Essence features the Swiss Technology Production STP1-11 caliber with hour, minute, second and date indication. The watch has 22mm lugs for the strap. The movement offers essential watchmaking functions with Swiss mechanism.

Frequently asked questions

What is the lug width of the Formex Essence 0330.4.6309.910?

The lug width is 22mm. To verify it correctly, measure the distance between the centres of the two lateral lug pins (inner shoulder): it should be exactly 22mm. This standard measurement ensures compatibility with the vast majority of contemporary straps in leather, NATO and rubber.

Which strap is best suited to the Formex Essence 0330.4.6309.910?

Italian vegetable-tanned leather in brown "testa di moro" is the recommended choice: it combines formal elegance with natural patina that evolves over time. Polished black alligator offers solidity and structure for formal occasions. A navy NATO introduces sporty informality, whilst grey rubber guarantees resistance in challenging conditions. Each choice depends on use context and personal aesthetic preference.

How do you change the strap on the Formex Essence 0330.4.6309.910?

Remove the old strap using a simple spring bar tool: insert the tip into the side groove of the lug, gently lift the elastic pin and slide the strap out. Repeat on the other side. Next, align the holes of the new strap with the lugs and insert the elastic pins until you hear a safety click. Verify that the strap is securely fastened on both sides.

Is it possible to use aftermarket straps compatible with the Formex Essence 0330.4.6309.910?

Yes, absolutely. The standard 22mm lug width allows total compatibility with quality aftermarket straps. Milano Straps are specifically made for this measurement, with pre-drilled lugs and artisanal finishes. Always verify that the strap lugs are pre-drilled and that the pin diameter is compatible (standard 1.8-2mm).

How long does a leather strap last over time?

An authentic vegetable-tanned leather strap typically lasts 3-5 years with regular daily wear. Durability depends on: frequency of wear, exposure to moisture and UV rays, tanning quality. Leather straps age nobly with the Formex: they develop natural patina and change in tone. FKM (Viton) rubber lasts longer (5-10 years) as it does not degrade like organic material. Maintenance with natural balms extends leather life by at least 2 years.

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