Strap for Constellation Master Chronometer 39 Stainless Steel / Yellow Gold - Diamond / Silver / Bracelet

The lug width of the 131.25.39.20.52.002 is 24 millimetres. This measurement corresponds to the internal space between the case lugs, where the strap is inserted. For an accurate measurement, use a digital calliper positioned between the two internal lug terminals, ensuring it is parallel to the case.

For this Constellation, we recommend premium alligator, which maintains the formal elegance of the model without compromising its versatility. Alligator with vegetable tanning in grey-hazelnut or cognac brown tones creates an aesthetic synergy with the grey-blue sunburst dial and the Sedna Gold case. Vegetable-tanned calf leather represents a more sustainable alternative, while Japanese shell cordovan offers a rigidity and waxy surface that responds well on the wrist.

Changing the strap on a Constellation requires a specific tool to remove the spring bars. Position the watch with the lug facing upwards, gently insert the tool tip into the small lateral hole of the spring bar to compress the internal spring, then slide the bar out of the case. Repeat the process for the other lug. Insert the new strap by aligning the lateral holes of the strap with the spring bars, then reinsert the bars into the case until you hear the click of closure.

Yes, any strap with a lug width of 24mm is compatible with the 131.25.39.20.52.002. However, we recommend choosing a strap made by specialised artisans who understand the aesthetics of the Constellation: noble materials (alligator, calf, shell cordovan), refined finishes and robust construction will ensure that your watch maintains its elegance and value over time.

The lifespan of a leather strap depends on daily use, tanning method and climatic conditions. A good quality calf or alligator strap with vegetable tanning can last 3-5 years under normal conditions if properly cared for (protection from excessive moisture and sweat). Shell cordovan, due to its denser fibrous structure, tends to last slightly longer. Periodic maintenance (gentle cleaning and conditioning with specific creams) significantly extends the useful life of the strap.