Oris · Big Crown

Strap for Big Crown Small Second Pointer Day Stainless Steel / Silver / Bracelet

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter44 mm
Reference01 645 7629 4061-07 8 22 76
FamilyBig Crown
MovementOris caliber Oris 645 hours, minutes, seconds | date, day
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Big Crown 01 645 7629 4061-07 8 22 76

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Big Crown 01 645 7629 4061-07 8 22 76, seen from the bench

The Oris Big Crown 01 645 7629 4061-07 8 22 76 is a 44mm stainless steel watch powered by the automatic Oris 645 caliber movement. It features an oversized crown designed for pilots wearing flight gloves, a super-luminova-filled dial for readability, and squared case lines reflecting 1960s aviation heritage. The 22mm lug width is specific to this reference and critical for strap compatibility and proper case-strap proportions.

Frequently asked questions

What is the lug width of the Oris Big Crown 01 645 7629 4061-07 8 22 76?

The lug width is exactly 22mm. This is the internal distance between the two case lugs where the strap attaches. Always verify this measurement before purchasing an aftermarket strap to ensure perfect compatibility.

What is the best strap for the Oris Big Crown 01 645 7629 4061-07 8 22 76?

The choice depends on your intended use. For elegance: vegetable-tanned Tuscan leather (Testa di Moro or cognac). For versatility: calf or shell cordovan. For practicality: technical NATO or vulcanised rubber. For metal: satin-brushed steel deployante.

How do you change the strap on a 44mm Oris Big Crown?

Use a spring bar removal tool to gently compress the internal spring of the lug, releasing the old strap. Insert the new strap by aligning the lugs to the case holes, then slowly release the spring bar. Never force: the movement should be fluid to avoid damaging the case.

Is it safe to use an aftermarket compatible strap with my Oris Big Crown?

Yes, provided the 22mm lug width is respected. A quality artisanal strap made with vegetable tanning or technical rubber ensures mechanical compatibility and durability equivalent to the original. Milano Straps specialises in custom straps designed for this category of watches.

How long does a leather strap last before needing replacement?

A quality strap with vegetable tanning lasts typically 3-5 years with daily use, developing a pleasant patina over time. Longevity depends on water exposure, sunlight, and perspiration levels. Vulcanised rubber or technical NATO lasts 5-7 years virtually unchanged.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only