Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Yellow Gold / Silver Diamond

The lug width of reference 131.20.29.20.52.002 is 18mm. This dimension is essential to guarantee compatibility: measured internally between the two pins that anchor the strap to the case, 18mm is the available space for the strap itself. Always verify this measurement before ordering an aftermarket strap.

An alligator strap with vegetable tanning in beige, cognac brown or burgundy is the traditional choice that enhances the yellow gold case and the sunburst blue dial. For formal versatility, smooth calf leather in black, navy or dark grey offers discreet tailoring. A natural shell cordovan, if available in 18mm, evolves over time creating a personal relationship with the watch.

The strap is changed using a spring bar tool (instrument with two flat ends) to compress the internal elastic pin: insert the tool into the lateral grooves of the pin, compress it slightly, and the pin retracts allowing removal of the old lug. The new strap with pre-assembled lug is inserted in the same way, verifying that the pin is completely locked in position. Avoid excessive force to prevent scratching the case.

Yes, any strap constructed with 18mm lug width is compatible. However, manufacturing tolerances vary: if the strap is produced with tolerances too tight, it could exert excessive pressure on the case lugs; if too loose, it could generate lateral play. MilanoStraps straps are tested to guarantee perfect fit, avoiding these issues.

A fine leather strap (vegetable-tanned alligator, shell cordovan) with proper maintenance lasts 4–7 years of regular use. Longevity depends on exposure to moisture, sweat and UV rays. Alligator and polished calf require monthly cleaning with a soft cloth; shell cordovan develops a natural protective patina over time. MilanoStraps offers an 18-month warranty on all artisanal straps.