Oris · Big Crown

Strap for Big Crown Pointer Date Calibre 403 Stainless Steel / Green

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference01 403 7799 4067-07 6 20 09FC
FamilyBig Crown
MovementOris caliber Oris 403 Hours, Minutes, Small Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

The Big Crown 01 403 7799 4067-07 6 20 09FC, seen from the bench

The Oris Big Crown features the Oris 403 automatic caliber with hour, minute, small seconds and date indication. The model features 20mm lugs and maintains the distinctive characteristics of the Big Crown collection. The reference 01 403 7799 4067-07 6 20 09FC identifies this specific configuration of the Swiss timepiece.

Frequently asked questions

What is the lug width of the Oris Big Crown 01 403 7799 4067-07 6 20 09FC?

The lug width is 20mm, measured between the two spring bars that secure the strap. This measurement is taken across the keeper slots on the case using a digital calliper, not the strap width itself. Milano Straps provides a dedicated collection of straps compatible with this exact lug width.

What is the best strap for the Big Crown 01 403 7799 4067-07 6 20 09FC?

The choice depends on usage and aesthetic preference. Vegetable-tanned alligator offers maximum patina development and chromatic evolution, creating harmonic accord with the satin-brushed steel case. For tactical approaches, canvas NATO permits swift changes without tools. Shell cordovan represents the middle path: incomparable fibre density with controlled colour progression over time.

How do I change the strap on the Big Crown 01 403 7799 4067-07 6 20 09FC?

Use a spring bar removal tool: position the forked tip beneath the spring bar and apply gentle downward pressure to compress the internal spring, then extract the bar from its seat. Once removed from both sides, the old strap lifts free. To install the new strap, align the spring bars with the keeper slots and apply firm pressure until the click-engagement confirms seating. Avoid excessive force that could damage the steel seats.

Can I use an aftermarket-compatible strap on my Oris Big Crown 01 403 7799 4067-07 6 20 09FC?

Yes, provided the strap is specifically constructed for a 20mm lug width. Artisanal straps from Milano Straps are built to this exact measurement, guaranteeing perfect fit without lateral play. The construction quality of an artisanal aftermarket strap frequently surpasses OEM strap accessories, particularly regarding material evolution and stitch integrity.

How long does a leather strap last on the Big Crown 01 403 7799 4067-07 6 20 09FC?

A quality leather strap (alligator, calf, shell cordovan) typically lasts 5–8 years with moderate daily use, accounting for solar exposure, humidity, and perspiration exposure. Longevity depends on tanning method: vegetable tanning ages whilst maintaining structure; synthetic chrome tanning degrades sooner. Canvas NATO straps last 10+ years if washed periodically. An FKM rubber strap maintains functionality for 7–10 years before elasticity degrades.

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