Strap for Chronoris Limited Edition

The lug width of the Oris Chronoris 01 673 7739 4034-Set LS is 20 millimetres. This dimension is measured between the internal fixing pins of the case. The 20-millimetre measurement is standard for 40-millimetre diameter chronographs and is proportionally balanced to ensure visual harmony between the case diameter and the strap.

For the Chronoris 01 673 7739 4034-Set LS in stainless steel, three solutions are recommended: high-quality alligator with fine grain for formality, vegetable-tanned calf leather for elegance that develops patina over time, or a NATO strap in premium canvas for sporting functionality. Each choice must respect the 20-millimetre lug width and reflect the functional austerity of the original design.

Changing the strap requires extraction of the fixing pins (spring bars) from the lugs. Use a watch-specific tool, inserting the blade into the lateral hole of the pin to compress the internal spring, extract it gently from the first lug, then repeat on the other side. Once the lugs are free, insert the pins into the new strap (compatible with 20 millimetres) and reinsert them into the lugs, snapping the pins into position until you hear an audible click.

Any artisanal strap with a 20-millimetre lug width is compatible with the Chronoris 01 673 7739 4034-Set LS. The best aftermarket options include alligator, shell cordovan, vegetable-tanned calf leather, canvas NATO, or rubber straps. Always verify that the pins (spring bars) are appropriate for a 20-millimetre width and that the total strap length is not less than 75 millimetres of developed length.

The lifespan of a leather strap depends on the type of tanning and usage. Vegetable-tanned calf leather, properly maintained, lasts between 18 and 36 months of daily wear. Alligator, being a denser vegetable leather, can last up to 48 months. Rubber, conversely, has greater durability (over 60 months) but loses elasticity more rapidly. The patina and natural creases that develop are not defects, but signs of authentic ageing.