Ball Watch · Fireman

Strap for Fireman Storm Chaser Stainless Steel / Black / Calf

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter43 mm
ReferenceCM2092C-L-BK
FamilyFireman
MovementBall Watch caliber RR1402 Hours, Minutes, Small Seconds | Date | Chronograph
CaseStainless 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 Fireman CM2092C-L-BK

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Fireman CM2092C-L-BK, seen from the bench

The Ball Fireman reference CM2092C-L-BK is equipped with the Ball Watch RR1402 caliber with hours, minutes, small seconds, date and chronograph functions. The movement offers the essential complications for a sporty everyday timepiece. The Fireman collection represents the technical line of the American brand Ball Watch.

Frequently asked questions

What is the lug width of the Ball Watch Fireman CM2092C-L-BK?

The Ball Watch Fireman CM2092C-L-BK features a lug width of 20 millimetres. This measurement, taken from pin to pin across the case lugs, is the critical specification for strap compatibility. Always measure pin-to-pin, excluding the spring bar itself.

Which strap material is best suited for the Ball Watch Fireman CM2092C-L-BK?

For the Fireman CM2092C-L-BK, we recommend vegetable-tanned alligator leather for an authentic, aged aesthetic that develops natural patina over time. Black calf leather offers refined uniformity for a more formal appearance. NATO straps in cotton provide the most practical, moisture-resistant option for intensive field use. All colour choices should respect the watch's technical and understated character.

How do I change the strap on a Ball Watch Fireman CM2092C-L-BK?

Use a spring bar tool with a flat tip. Position the tool underneath the spring bar on the opposite side from where you wish to remove it, gently depress to compress the internal spring, and extract. Repeat on the other lug. Insert the spring bar into your new strap, align carefully, and press until you hear and feel a distinct click. Verify secure seating before wearing.

Are third-party straps truly compatible with the CM2092C-L-BK?

Yes, provided they meet the 20mm lug width specification. Any quality strap adhering to this standard will be mechanically compatible. Milano Straps produces hand-crafted straps in this size with rigorous quality control on each piece, ensuring complete compatibility and artisanal finishing superior to factory OEM standards.

What is the typical lifespan of a leather strap on this watch?

A quality vegetable-tanned leather strap on the CM2092C-L-BK, worn daily, maintains structural integrity and comfort for approximately 18–24 months. Longevity varies with usage frequency, moisture exposure, specific material (alligator outlasts calf), and maintenance practices. Regular treatment with natural oils significantly extends strap lifespan.

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