Technical Archive

Leroy
Osmior Range LL103/1— lug 20mm

Leroy Osmior Range LL103/1: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Osmior Retrograde Perpetual Date Pink

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Leroy LL103/1
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

LL103/1

Movement

Leroy caliber L411.2 Hours, Minutes, Small Seconds | Date, Day, Leap Year, Month, Perpetual Calendar | Moonphase

The Heritage

The Leroy Osmior Range reference LL103/1 is equipped with the L411.2 caliber with full perpetual calendar complications, including a leap year indicator. The watch features hours, minutes, small seconds, date, day, month and moon phases functions. The movement automatically manages the irregularities of the Gregorian calendar without the need for manual corrections until 2100.

FAQ

What is the lug width of the Leroy Osmior Range LL103/1?

The Leroy Osmior Range LL103/1 features a lug width of 20mm. This measurement corresponds to the distance between the two integrated lugs on the case and is essential for determining strap compatibility. The 20mm dimension is a relatively accessible size within the aftermarket strap market, ensuring extensive customisation options without compromising artisanal quality.

Which strap is recommended for the Leroy Osmior Range LL103/1?

For the LL103/1 in rose gold, we prioritise alligator leather, whose natural grain synchronises aesthetically and materially with the evolving patina of rose gold over time. Shell cordovan represents an equally refined alternative, whilst vegetable-tanned leather is ideal for those preferring sustainable approaches without quality compromise. NATO and rubber straps embody conscious contemporaneity, perfect for blending sports utility with haute horlogerie sensibility.

How do I change the strap on my Leroy Osmior Range LL103/1?

Changing the LL103/1 strap requires specific tools: a spring bar tool to extract the lugs from the integrated case attachments. Operate on a clean surface, protecting the case with a soft cloth throughout the procedure. The Leroy's integrated lugs ensure precise fit; the new strap must insert completely into the lugs without forcing. For models with particular material sensitivity, professional assistance is advisable.

Can I use a high-quality aftermarket strap on my Leroy Osmior Range LL103/1?

Absolutely. High-quality artisanal aftermarket straps represent the most frequent choice among owners of Leroy models of this calibre. Verify only that the lug width is 20mm and the strap is crafted from premium materials: alligator, shell cordovan or vegetable-tanned leather. Superior aftermarket straps guarantee evolving patina and durability comparable to factory straps, with the advantage of aesthetic customisation and optimal comfort.

What is the expected lifespan of a leather strap for the Leroy Osmior Range LL103/1?

A high-quality artisanal leather strap, crafted in alligator or shell cordovan, guarantees 5-8 years of daily wear with routine maintenance. Longevity depends on environmental factors (humidity, sun exposure), frequency of use and leather quality. Vegetable-tanned leather tends to patina more rapidly, developing characteristic aesthetics within 2-3 years. Regular water-repellent treatments and rotation with other straps significantly extend product lifespan.