Strap for HMS1

The lug width of the Arnold & Son Royal Collection 1LCAS.S01A.C111S is 20 millimetres. This measurement represents the distance between the two attachment points on the case lugs where the strap is affixed. To verify the lug width correctly, position a digital calliper from the inside of one lug to the inside of the other, excluding the thickness of the spring bars. An accurate lug width measurement ensures the strap fits perfectly to the case without excessive width or deficiency.

For the Royal Collection 1LCAS.S01A.C111S, we recommend an alligator strap with natural vertical grain, which reflects the neoclassical heritage of the collection. Alternatively, a shell cordovan strap with vegetable tanning develops a golden patina that enhances the British character of the timepiece. For more versatile daily wear, a smooth or slightly grained calf leather in brown or black tones offers the right combination of formal elegance and practicality. For warm climates or sports use, a robust cotton NATO strap maintains the stylistic integrity without functional compromise.

To change the strap, position the watch with the case facing upwards. Use a dedicated spring bar tool, inserting the fine tip into the slot beside the lug pin. Apply light, constant pressure to retract the spring-loaded pin, then extract the old strap. Repeat on the other side. To fit the new 20mm strap, align the strap holes with the lugs and reinsert the pins using the same tool, ensuring both sides are fully secured. Avoid excessive force during extraction, as the original polished finish of the case may be damaged.

Yes, the 1LCAS.S01A.C111S is fully compatible with aftermarket straps of 20mm lug width. However, to ensure the strap appears coherent with the formal aesthetic of the Royal Collection, choose materials of elevated quality: alligator, shell cordovan, calf leather with vegetable tanning, or robust cotton for textiles. Avoid low-quality chrome-tanned leather or synthetic straps, as these would betray the attention to detail of the original timepiece. Milano Straps offers a curated selection of artisanal 20mm straps crafted from premium materials, guaranteeing perfect compatibility and aesthetic coherence with the Royal Collection.

The lifespan of a natural leather strap depends on the quality of the hide and frequency of wear. A high-quality alligator or shell cordovan strap with vegetable tanning can last 5–8 years of daily use, developing a richer patina and additional visual character over time. A quality calf strap typically lasts 3–5 years of regular wear before showing significant signs of deterioration. A robust cotton NATO strap can last 7–10 years. Critical factors include exposure to heat and humidity, frequency of wear, and periodic maintenance (gentle cleaning, conditioning with natural creams). After the buckle or deployante clasp wears, the strap can still be restored by replacing the closure element, extending its useful life by several additional years.