Arnold & Son
Instrument Collection 1TPAR.S01A.C125A— lug 20mm

The lug width of the 1TPAR.S01A.C125A is 20mm. This dimension is standard for contemporary high-end chronographs and requires straps specifically sized to ensure precise and stable fitment. When selecting an aftermarket strap, always verify compatibility with 20mm lug width specifications.

For the 1TPAR.S01A.C125A, we primarily recommend alligator or vegetable-tanned calf leather straps in dark tones (black, deep brown, slate grey). These materials enhance the warmth of the Red Gold case and reflect the technical heritage of the Instrument Collection. Valid alternatives include NATO straps for daily versatility and FKM rubber for aquatic activities. Your choice should align with the intended use context.

Strap replacement is accomplished by removing the spring bars located within the lugs. Use a dedicated spring bar tool to compress the lower bar and slide the old strap horizontally. After removal, insert the new strap by aligning its passages with the lugs and push the spring bar until it settles into its natural position. Verify that the lug diameter is precisely 20mm before proceeding.

Any strap with a 20mm lug width is compatible with the 1TPAR.S01A.C125A. Milano Straps offers a dedicated collection of 20mm straps in leather, NATO, and rubber, selected for aesthetic coherence with prestige chronographs. Compatibility is guaranteed through dimensional tolerance verification within ±0.5mm of the nominal 20mm specification.

A quality leather strap (alligator, calf, shell cordovan) has an average lifespan of 3-5 years under moderate use conditions. Longevity depends on usage intensity, humidity exposure, and maintenance standards. Vegetable tanning develops a protective patina that improves resistance over time. To extend service life, rotate between straps and periodically apply specialised water-repellent treatments.