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Oris · ProPilot

Strap for Big Crown ProPilot GMT Rega Fleet AgustaWestland Da Vinci - HB-ZRX

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

Lug width

20mm
20 mm strapsAll Oris
Lug width20 mm
Case diameter42 mm
Reference01 798 7773 4284 HB-ZRX-Set
FamilyProPilot
MovementOris caliber Oris 798 hours, minutes, seconds, Additional 24 hours Hand (adjustable) | date
Year2021
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the ProPilot 01 798 7773 4284 HB-ZRX-Set

Selected for the 20 mm lug width

All 20 mm straps →

The ProPilot 01 798 7773 4284 HB-ZRX-Set, seen from the bench

The Oris ProPilot 01 798 7773 4284 HB-ZRX-Set is a chronograph born from Swiss aviation watchmaking tradition since 1917. The satin steel case measures 41.5mm with integrated squared lugs and readable dial in all lighting conditions. It features the Oris 798 mechanical movement with column wheel chronograph, balance with Nivarox hairspring, anchor escapement, and independent 24-hour hand for intercontinental flights. The 20mm lug width is proportionally calculated for the case diameter, creating balanced aesthetics with white gold applied indices and magnified date window at 3 o'clock.

Frequently asked questions

What is the exact lug width of the Oris ProPilot 01 798 7773 4284 HB-ZRX-Set?

The lug width is 20mm, measured internally between the inner lug shoulders. This width is proportioned to the 41.5mm case diameter and accommodates standard aftermarket straps with 1.6mm diameter spring bars.

Which strap is best suited for the Oris ProPilot 01 798 7773 4284 HB-ZRX-Set?

Shell cordovan with vegetable tanning is the most coherent choice, developing rich patina over time whilst balancing elegance and everyday practicality. Alternatives include natural alligator for formal occasions, dense NATO for daily wear, or technical rubber for dynamic activities. Selection depends on intended use.

How do I change the strap on my Oris ProPilot 01 798 7773 4284 HB-ZRX-Set?

Insert the spring bar end into one of the lateral lug holes using a flat tool or dedicated pusher, then remove the existing strap. Align the new strap correctly before reinserting the spring bars into the lugs. Work on a soft surface to prevent scratches.

Are aftermarket straps compatible with the 01 798 7773 4284 HB-ZRX-Set?

Yes, provided they are manufactured for 20mm lug width and use standard 1.6mm diameter spring bars. Always verify that the inner lug width of the new strap matches 20mm to ensure secure, rattle-free attachment.

How long does a leather strap last on a wristwatch like the ProPilot?

A quality leather strap with vegetable tanning or shell cordovan typically lasts 3–5 years with regular wear, provided prolonged water exposure is avoided and the strap is dried immediately after contact. Durability increases with sporadic wear. Patina development is normal and desirable.

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