Arnold & Son · Royal Collection

Strap for HMS1

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

Lug width20 mm
Case diameter40 mm
Reference1LCAP.U02A.C110A
FamilyRoyal Collection
MovementArnold & Son caliber A&S1001 hours, minutes, small seconds
CaseRose Gold

Spring bar

Swiss Standard universal spring bars

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

Straps for the Royal Collection 1LCAP.U02A.C110A

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Royal Collection 1LCAP.U02A.C110A, seen from the bench

The Arnold & Son Royal Collection features the in-house caliber A&S1001 with hours, minutes and small seconds indication. The movement offers a classic three-hand configuration with a subsidiary small seconds display. The Royal Collection represents one of the core lines of the Swiss brand Arnold & Son.

Frequently asked questions

What is the lug width of the Arnold & Son Royal Collection 1LCAP.U02A.C110A?

The lug width is 20mm. This measurement is determined by the case proportions and lugs geometry. To verify it correctly, measure the internal distance between the lower fastening points where the strap attaches to the case lugs.

Which strap is most suitable for the Arnold & Son Royal Collection 1LCAP.U02A.C110A?

Tobacco brown alligator is the natural choice for this rose gold reference: the structured grain dialogues with the case's clean geometry, creating harmonious aesthetic contrast. Alligator maintains visual proportionality and develops a patina that remains stable over time. For intensive daily use, burgundy shell cordovan offers natural lustre that progressively mirrors the gold.

How do I change the strap on this model?

Use a dedicated tool (remove bar or spring bar tool) to disengage the elastic pins from the lower case lugs. Gently extract the pins, remove the old strap, and insert the new one by sliding the pins into the lateral slots until complete fastening. Verify that the 20mm lug width allows housing without lateral play.

Can I use an aftermarket strap on this Arnold & Son?

Yes, provided it respects technical specifications: 20mm lug width, thickness between 3.5 and 4.5mm to ensure compatibility with lug depth, and adequate length for your wrist (typically 75mm upper part, 115mm lower part). Milano Straps offers artisanal straps in leather, NATO and rubber, all tested for this reference.

How long does a leather strap last on this watch?

A quality alligator strap, subjected to moderate daily wear, typically lasts 4-6 years before replacement is required. Shell cordovan, thanks to greater fibre density, can reach 6-8 years. Longevity depends on frequency of use, humidity exposure and protection from thermal variations. Regular maintenance with specific creams 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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only