Oris · Classic

Strap for Oris Classic 01 733 7578 4061

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter37 mm
Reference01 733 7578 4061
FamilyClassic
MovementOris caliber Oris 733 Hours, Minutes, Seconds | Date

Spring bar

Swiss Standard universal spring bars

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

The Classic 01 733 7578 4061, seen from the bench

The Oris Classic reference 01 733 7578 4061 is powered by the Oris 733 caliber, with hour, minute, second and date indications. The stainless steel case measures 37mm in diameter with 18mm lugs. The movement offers the essential time and calendar functions in a traditional three-hand configuration.

Frequently asked questions

What is the lug width of the Oris Classic 01 733 7578 4061?

The Oris Classic 01 733 7578 4061 features an 18mm lug width. This measurement is taken internally between the two lugs (the protruding parts of the case where the strap attaches). It is essential to verify this measurement directly on your case before ordering a strap, as even minor discrepancies of 1-2mm can compromise the fit.

Which strap do you recommend for this Oris model?

For the Oris Classic 01 733 7578 4061, we primarily recommend dark brown alligator with vegetable tanning, which amplifies the minimalist elegance of the design. Alternatively, black calf leather with a painted edge offers sartorial character. For daily wear, a grey anthracite NATO or natural rubber strap in navy blue provides practicality without aesthetic compromise. Your choice should reflect intended use: formal, casual, or sporty environments.

How do I change the strap on my Oris Classic?

Strap replacement is accomplished by removing the lugs (the case extensions that hold the strap in place). Use a spring bar tool to compress the pin connecting the lug, then gently extract the old strap. Align the new strap within the lugs and carefully reinsert the pin, compressing it until you hear a definitive click. Always verify that the pin is fully inserted before wearing the watch.

Are 18mm aftermarket straps compatible with the Oris Classic 01 733 7578 4061?

Yes, any strap with an 18mm lug width is compatible with this model, provided the internal measurement is correct. We recommend straps crafted from certified quality materials: Mississippi alligator, vegetable-tanned calf, cotton or linen for NATO styles, and natural rubber. Always select straps from specialised artisans to ensure longevity and comfort over time.

How long does a leather strap last on my Oris Classic?

A high-quality alligator or calf leather strap, with proper maintenance, lasts between 3 and 7 years depending on frequency of use and climatic conditions. Vegetable-tanned leather improves with age, developing a deeper, richer patina. To extend strap life, clean regularly with a soft brush, hydrate the leather every six months with leather-specific creams, and allow the material to breathe in dry environments during periods of non-use. Avoid prolonged exposure to moisture, chlorine, and excessive perspiration.

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