Oris · Big Crown

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

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 5 22 76FC
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 5 22 76FC

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Big Crown 01 645 7629 4061-07 5 22 76FC, seen from the bench

The Oris Big Crown features the Oris 645 automatic caliber with indication of hours, minutes, seconds, date and day of the week. The watch has 22mm lugs and represents the contemporary interpretation of the brand's aviation watches. The model maintains the essential functional features for time reading with calendar complications.

Frequently asked questions

What is the lug width of the Oris Big Crown 01 645 7629 4061-07 5 22 76FC?

The lug width is 22mm. This dimension is specific to large-diameter sports models such as the 44mm Big Crown, ensuring visual proportion and comfort. Always verify the measurement with a calliper positioned between the two strap spring bars.

What is the best strap option for the Oris Big Crown 01 645 7629 4061-07 5 22 76FC?

Tuscan leather in vegetable tanning is the most authentic choice for this aviation timepiece: it develops a rich patina over time and honours the watch's historical era. Alternatively, Mexican alligator in cognac offers understated elegance, or a NATO in polyamide for those prioritising practicality and moisture resistance.

How do you change the strap on an Oris Big Crown?

Use a spring bar removal tool or a 1.2–1.5mm diameter pin. Position the watch on a stable surface, gently press the spring bar down on one side, then extract the pin. Repeat on the other side. Insert the new strap by aligning the holes with the spring bars, then compress until the retention click is felt.

Are there certified compatible aftermarket straps for the Oris Big Crown 01 645 7629 4061-07 5 22 76FC?

Yes, 22mm-compatible straps are available from Milano Straps: Tuscan vegetable-tanned leather, tanned calfskin, alligator, vulcanised rubber, and polyamide NATO straps. All are designed for 22mm lugs and ready to ship.

How long does a leather strap last on a watch like the Big Crown?

A hand-crafted vegetable-tanned leather strap can last 3–5 years with moderate daily use. Durability depends on exposure to moisture, perspiration, and UV rays. With periodic care—gentle cleaning, air drying, annual conditioning—lifespan extends significantly, and the leather develops a desirable patina.

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.

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