Breguet
Classique 5178BR/29/9V6/D000— lug 18mm

The lug width of the Breguet Classique 5178BR/29/9V6/D000 is 18mm. To verify on your own watch, it is advisable to measure the internal distance between the lugs with a digital caliper: the reading should be exactly 18.0mm. This measurement determines the correct strap width to purchase.

For the Classique 5178BR/29/9V6/D000 in rose gold, a smooth alligator strap is the absolute reference: the natural grain texture complements the guilloché dial. Alternatively, polished Box Calf leather or Barenia—which develops a warm patina over time—pair with excellent aesthetic coherence to the rose gold case. The correct width is 18mm at the lugs.

The strap is replaced by removing the spring bars that connect the half-bracelets to the lugs of the case. Use a dedicated strap changing tool or a small flathead screwdriver. With a rose gold case, it is essential to protect the lugs with a soft cloth to avoid scratches. If in doubt, it is preferable to consult a watchmaker or the Casati Milano atelier.

Yes, any 18mm lug width strap is technically compatible with the Breguet Classique 5178BR/29/9V6/D000. Milano Straps offers a selection of artisanal 18mm straps in alligator, calf leather, and other fine materials, produced using the same sartorial techniques as original straps. For a bespoke result, the Casati Milano atelier creates custom straps with choice of leather, color, and buckle.

The lifespan of a leather strap depends on the material and daily use. A quality alligator strap, with proper care—avoiding water, sweat, and prolonged direct sunlight—can last 3 to 5 years of regular use. Box Calf leather tends to wear more quickly but develops a characteristic patina. Casati Milano straps are covered by an 18-month warranty against manufacturing defects.