Strap for Excellence Le Régulateur Louis Erard x Konstantin Chaykin

The lug width is 22mm. This measurement refers to the horizontal distance between the two spring bar holes of the case, excluding the bars themselves. To verify it with precision, use a digital calliper positioned on the inner edges of the lugs.

For the Excellence 85237AA88.BGA088, we recommend vegetable-tanned leather in dark tones (midnight blue, chocolate brown, black): it creates formal balance with the austere dial and develops natural patina over time. For intense daily use, robust NATO fabric or FKM rubber offer versatility. Shell cordovan represents the compromise between tactile rigour and constructive longevity.

Position the watch on a flat surface. Using a non-invasive tool (spring bar tool), apply gentle inward pressure on one of the spring bars until the spring yields. Remove the spring bar and subsequently the lug. Insert the new strap by engaging the spring bar into the appropriate holes, ensuring it is fully secured. Repeat on the opposite side.

Yes, any 22mm lug width strap is mechanically compatible. However, verify that the material thickness does not exceed 4–5mm at the bar section to avoid friction with the case. Artisanal leather or fabric straps typically maintain optimal proportions for this model. Aesthetic compatibility depends on the tone and texture you wish to emphasise.

A vegetable-tanned leather strap on a daily-wear watch like the Excellence, worn 8–10 hours per day, maintains structural functionality for 4–7 years. Longevity varies based on exposure to moisture, perspiration, and heat. Vegetable tanning ages visibly, developing patina and wear that constitute distinctive character, not defects. Minimal maintenance (annual conditioning) significantly extends aesthetic longevity.

Absolutely. Robust NATO fabric transforms the Excellence into a semi-technical instrument, eliminating any formal pretence and emphasising the constructive nature of the case. NATO versatility allows rapid colour swaps, whilst the absence of excessive lugs maintains proportional harmony of the 42mm case. It is the ideal pairing for those using the watch in dynamic professional contexts or humid environments.