Strap for Tourbillon Régulateur Pour Dubail

The Leroy Limited Series LL109/1 features a lug width of 20mm: the linear distance between the two spring bar attachment points on the case is precisely 20 millimetres centre to centre. This measurement was deliberately selected by the manufacture to maintain harmonious proportions between the case diameter (41mm) and the crown depth. Any strap replacement must rigorously respect this technical specification.

For the LL109/1 in white gold, alligator leather with fine grain remains the reference choice: the natural epidermis texture dialogues with the satin-finished case surface without visual competition. Alternatively, vegetable-tanned calf with medium patina in mahogany brown complements the cold white gold through subtle chromatic contrast. For formal occasions, deep black leather with white-plated metal clasp represents the absolute evening option.

Changing the strap on a timepiece of such elevated value as the LL109/1 requires specific tools (spring bar remover) and methodical procedure. Position the watch with the case parallel to the work surface, using a silicon cushion to protect the crown from direct contact. Carefully extract the spring bars through controlled pressure, working from bottom to top to minimise the risk of scratching. Insert the new strap, verifying that the spring bars enter the lugs perfectly while maintaining alignment with the case geometry. We strongly recommend entrusting this intervention to a certified professional service centre, particularly for a Limited Series timepiece.

Yes, aftermarket straps certified for the 20mm lug width are perfectly compatible with the LL109/1, provided the measurement is exact (centre-pin to centre-pin). The strap quality must be coherent with the value and refinement of the white gold case: favour artisanal productions with material certification (alligator, vegetable-tanned calf, shell cordovan) rather than mass-produced alternatives. Milano Straps straps offer the guarantee of skilled craftsmanship and materials selected specifically for timepieces in this category.

A quality leather strap (alligator, vegetable-tanned calf) mounted on an LL109/1 maintains full functionality for 3 to 5 years provided regular maintenance: avoid prolonged contact with water, perspiration and chemical substances, dry gently after humidity exposure, store in a temperature-controlled environment. The natural patina that develops over time is a positive characteristic of the material, not deterioration. Shell cordovan, thanks to the fibrous structure of horse leather, can achieve 6 to 8 years of intensive use. Cotton NATO or FKM rubber straps have superior longevity (8-10 years) but still require periodic inspection of the attachment holes.