Prim · Sport

Strap for Orlík 38 Small Seconds Stainless Steel / Black / Rubber

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

Lug width20 mm
Case diameter38 mm
Reference105-005-487-00-1
FamilySport
MovementPrim caliber PRIM KALIBR 105 hours, minutes, small seconds
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 Sport 105-005-487-00-1

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Sport 105-005-487-00-1, seen from the bench

The Prim Sport 105-005-487-00-1 is a Czech watchmaking piece with a 38 mm stainless steel case and manual-winding Prim caliber PRIM KALIBR 105 movement. It features small seconds and a sapphire caseback exposing the mechanism. The 20 mm lug width accommodates the proportions of this compact sports watch, designed with functional minimalism characteristic of Czech calibers. Stainless steel case without surface treatments develops natural patina over time.

Frequently asked questions

What is the lug width of the Prim Sport 105-005-487-00-1?

The lug width is 20.00 millimetres. This measurement represents the distance between the two attachment pins that hold the strap to the case. To verify strap compatibility, measure this distance precisely: it must equal exactly 20 mm.

What is the best strap for the Prim Sport 105-005-487-00-1?

The optimal strap choice depends on intended use. For classical-formal contexts, we recommend alligator with traditional tanning or vegetable-tanned calf leather. For sporting versatility, a heavyweight NATO fabric strap is ideal. Casati Milano crafts custom straps to ensure the lugs fit your 20 mm attachment points perfectly.

How do I change the strap on the Prim Sport 105-005-487-00-1?

To change the strap, extract the pins (small metal cylinders securing the strap to the lugs). Use a spring bar tool to apply lateral pressure to one pin, freeing it from its seat. Slide the old strap out from under the lugs, then repeat the process with the new strap. Never force the pins; you risk permanent damage to the case.

Can I use an aftermarket strap on the Prim Sport 105-005-487-00-1?

Yes, provided the strap is specifically dimensioned for 20 mm lug width. Compatible straps must have properly sized lugs (the sections that wrap around the case lugs). Always verify specifications with the manufacturer. Casati Milano straps are bespoke-crafted to guarantee perfect constructive fit.

How long does a leather strap last on the Prim Sport 105-005-487-00-1?

A quality leather strap (alligator with vegetable tanning or calf leather) can last 3–5 years under regular wear, depending on exposure to moisture, perspiration, and mechanical stress. Vegetable-tanned leather develops a natural patina that reveals character over time. A rubber or NATO strap offers comparable durability whilst maintaining stable technical properties without aesthetic alteration.

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