Strap for HM Perpetual Moon

The Arnold & Son Royal Collection 1GLAS.B01A.C122S is fitted with 20-millimetre lugs. This standard, verifiable by measuring the distance between the two spring bars on the case, allows you to mount any certified aftermarket strap in 20mm sizing, ensuring both mechanical and aesthetic compatibility with the proportions of the 42mm case.

For this timepiece we primarily recommend alligator with vegetable tanning (colours: black, taupe brown, cognac) which references the historical British context of the brand and develops natural patina over time. Shell cordovan in bordeaux or cognac brown is a sophisticated choice for those preferring luminosity and compactness. For intensive daily wear, a high-density woven NATO in navy blue or charcoal grey provides versatility without aesthetic compromise.

Strap replacement is accomplished by removing the two side spring bars that attach the strap to the case. Use a dedicated spring bar tool to prevent scratching: insert the tip into the bar's slot, gently lift to release the internal spring, then extract the bar. Repeat on the other side. Reverse the procedure to install the new strap. If unfamiliar with this operation, entrust it to a certified professional.

All straps with straight lugs measuring 20 millimetres are compatible. Our catalogue includes vegetable-tanned alligator, shell cordovan, woven NATOs, and natural vulcanised rubber, each available in multiple shades and finishes (couture, piqué, grain) that guarantee both mechanical and aesthetic compatibility. We personally verify every model before dispatch.

A quality leather strap (alligator or shell cordovan) mounted on a daily-wear wristwatch typically lasts 3 to 5 years before requiring replacement, as continuous flexing and exposure to humidity, fragrance, and perspiration progressively weakens the fibres. This is standard practice in watchmaking; to extend the strap's lifespan, alternate its use with a NATO or rubber during summer months or periods of intense activity.