Oris · Big Crown

Strap for Big Crown Pointer Date Bronze / Fratello Watches

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 754 7741 3188 (aka: FratelloWatches)
FamilyBig Crown
MovementOris caliber Oris 754 hours, minutes, seconds | date
Year2020
CaseBronze, Stainless 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 01 754 7741 3188 (aka: FratelloWatches)

Selected for the 20 mm lug width

All 20 mm straps →

The Big Crown 01 754 7741 3188 (aka: FratelloWatches), seen from the bench

The Oris Big Crown 01 754 7741 3188 is a 40mm bronze case watch reinterpreting Swiss nautical chronometer heritage. The Cu-Sn bronze develops natural patina over time, creating a unique biographical appearance. Powered by the proprietary Oris caliber 754 movement (modified Sellita SW 200-1) running at 28,800 A/h with 38-hour power reserve. The 20mm lug width is specifically calibrated to the Big Crown case geometry, requiring precise measurement between internal pins. This strap size provides balanced proportions and is recommended for wrists between 17-20cm circumference.

Frequently asked questions

What is the lug width of the Oris Big Crown 01 754 7741 3188?

The lug width is precisely 20mm. This measurement must be taken between the internal pins that anchor the strap to the case lugs. It is a specific dimension, less common than the standard 22mm or 24mm, so compatibility verification is essential before purchasing aftermarket straps.

What is the best strap for the Oris Big Crown 01 754 7741 3188?

The choice depends on intended use. For authentic nautical aesthetics, we recommend Mississippi alligator with fine grain (cognac or black colour). For practicality and lightness, a navy blue acrylic twill NATO. For formal elegance, bordeaux shell cordovan. The bronze case particularly benefits from leather straps with vegetable tanning, which develop complementary patina over time.

How do you change the strap on the Oris Big Crown 01 754 7741 3188?

Strap replacement requires a spring bar remover tool to extract the elastic pins from the lugs. Insert the flat tool between the lug and strap, applying gentle pressure to expand the pin and free it from its housing. Repeat on the opposite side. To mount the new strap, position the pins in the housings and press until the locking click is felt. For certainty, entrust the replacement to Casati Milano for professional service.

Are there compatible aftermarket straps for the Oris 01 754 7741 3188?

Yes, but exclusively 20mm lug width straps. Not all brands manufacture this dimension, as it is less common. milanostraps.it offers a specialised selection: alligator leather, shell cordovan, Italian calf with vegetable tanning, NATO, and FKM rubber. All designed for this specific measurement and ready for dispatch.

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

A quality leather strap (alligator or shell cordovan with vegetable tanning) maintains structural functionality between 5 and 8 years of daily wear, developing a fascinating patina over time. Longevity depends on humidity exposure and chlorine contact. A strap subjected to frequent marine environments or perspiration may require replacement after 2-3 years. FKM rubber lasts longer but loses elasticity after 10 years. Regular maintenance — monthly cleaning, quarterly conditioning — significantly extends useful life.

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