Arnold & Son · Royal Collection

Strap for Hornet James Cook Set

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

Lug width20 mm
Case diameter47 mm
Reference1H6AP.D05A.C60B
FamilyRoyal Collection
MovementArnold & Son caliber A1766 hours, minutes, Additional 24 hours Hand (adjustable), world time | big date, month | Solar time
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 1H6AP.D05A.C60B

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Royal Collection 1H6AP.D05A.C60B, seen from the bench

The Arnold & Son Royal Collection reference 1H6AP.D05A.C60B features a 47mm rose gold case paired with the in-house Arnold & Son A1766 caliber. This timepiece combines 24-hour indication, World Time with large date and month display, and solar time on a symmetrical dial reflecting 18th-century British pocket watch heritage. The 20mm lug width ensures precise proportions and balanced weight distribution on the wrist, with center-to-center measurements critical for secure strap fit and long-term comfort.

Frequently asked questions

What is the exact lug width of the Arnold & Son Royal Collection 1H6AP.D05A.C60B?

The lug width of the 1H6AP.D05A.C60B is precisely 20 millimetres, measured centre-to-centre between the upper and lower case lugs. This width is calibrated to the proportions of a 47mm rose gold case and ensures correct visual balance. Verify the measurement using a digital calliper, positioning it directly on the inner surface of the lugs.

Which strap material is most recommended for the Royal Collection 1H6AP.D05A.C60B?

For this timepiece, alligator with vegetable tanning represents the choice of maximum elegance, befitting the solemnity of rose gold. Alligator offers sophisticated texture and exceptional durability. Alternatively, shell cordovan develops a fascinating patina over time, whilst NATO straps in military cotton create a contemporary aesthetic contrast. Supreme-quality FKM rubber guarantees functionality without compromise in humid environments.

How do I change the strap on the Arnold & Son Royal Collection whilst maintaining case integrity?

Strap replacement requires specific tools: a small spring bar tool and a soft surface (microfibre cloth) to protect the rose gold case from scratches. Position the watch with one lug facing you, insert the small end of the spring bar tool into the lower lug slot to compress the metal bar, then withdraw the old strap end. Repeat for the upper lug. Throughout this operation, always support the case on both sides to distribute weight evenly.

Can I use an aftermarket strap compatible with the 20mm lug width on this watch?

Yes, any strap with a 20mm lug width is compatible with the 1H6AP.D05A.C60B, as the standard spring bar (1.5mm diameter) enters the lugs regardless of material. However, the aesthetic excellence of the watch merits straps of equivalent construction quality: verify that the leather is vegetable-tanned, that stitching is regular, and that the grain is natural. Low-quality aftermarket straps betray the value of rose gold.

How long does a leather strap last on a daily-worn watch such as the 1H6AP.D05A.C60B?

A quality vegetable-tanned leather strap (alligator, shell cordovan, calf) worn daily lasts approximately 3–5 years, depending on ambient humidity, frequency of sun exposure, and maintenance regularity. Leather with vegetable tanning, being unplasticised, requires occasional neutral wax treatments to preserve flexibility. Shell cordovan, being pure vegetable leather, ages more nobly but demands greater care. In high-humidity environments, a supreme-quality FKM rubber strap offers superior longevity (8–10 years) whilst requiring regular cleaning.

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