Strap for Chronoris Date / Grey / Bracelet

The lug width of the Oris Chronoris 01 733 7737 4053-07 8 19 01 is 19mm. This measurement represents the distance between the two metal pins (spring bars) connecting the case to the strap. To verify, wear the watch and measure with a digital calliper the external distance between the pins: it must be exactly 19mm. This standardisation ensures compatibility with quality artisanal straps.

For the Chronoris, we recommend vegetable-tanned leather straps (alligator, shell cordovan, calf) for elegant-sportive contexts, or NATO straps in heavy fabric for everyday practicality. If your primary use is summer or aquatic-oriented, a vulcanised rubber strap offers convenience without aesthetic compromise. Your choice should balance occasion of use with desired aesthetic patina.

Remove the lugs from the case using a dedicated tool (spring bar tool). Locate the two pins at the lug ends, insert the bifurcated tip of the tool under the pin to compress the internal spring, then slide the pin out of its housing. Repeat for the second pin. Next, position the new strap (19mm lug width) aligning the pins to the housings and press until they click into place. If inexperienced, consult a professional watchmaker.

All straps with 19mm lug width are compatible, regardless of brand. Seek straps specifically labelled as 19mm lug width. Choose quality materials: vegetable-tanned leather, NATO in heavy cotton or nylon, structured vulcanised rubber, shell cordovan. Avoid synthetic leather or economy rubber, which deteriorate quickly and betray your chronograph's construction quality.

A quality leather strap (alligator, calf, shell cordovan) with vegetable tanning, worn regularly on a 39mm chronograph like yours, typically lasts 3–5 years before replacement is needed. Longevity depends on wearing frequency, ambient humidity, maintenance care, and construction quality. A leather strap with naturally developed patina bears witness to authentic use. Vegetable-tanned leather ages better than industrial tanning, acquiring aesthetic character over time.