Oris · ProPilot

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

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

Lug width20 mm
Case diameter41.5 mm
Reference01 798 7773 4284 HB-ZRP-Set
FamilyProPilot
MovementOris caliber Oris 798 Hours, Minutes, Seconds, Additional 24 Hour Hand (adjustable) | 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 ProPilot 01 798 7773 4284 HB-ZRP-Set, seen from the bench

The Oris ProPilot 01 798 7773 4284 HB-ZRP-Set is a Swiss aviation chronograph combining absolute legibility with instrumental reliability. Featuring a 41.50 mm stainless steel case and Oris 798 automatic movement with 24-hour GMT function, date, hours, minutes, and seconds, this pilot watch is designed for those flying across meridians or working international shifts. The 20 mm lug width is dimensionally critical and must be measured precisely between the case lugs to ensure proper strap compatibility without lateral gaps or forced attachment.

Frequently asked questions

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

The lug width is 20 mm, measured as the internal distance between the two lateral attachment rings of the case. This dimension is constant across the ProPilot model line and requires exclusively compatible straps with corresponding width. To verify accurate measurement, use a digital calliper positioned between the lugs: the distance must read precisely 20 mm.

Which strap is most suitable for the ProPilot 01 798 7773 4284 HB-ZRP-Set?

Selection depends on intended use and aesthetic preference. For sartorial elegance: vegetable-tanned leather (honey, cognac, burgundy tones). For practical versatility: polyamide NATO textile strap. For sporting and humid environments: waterproof rubber with deployante buckle. Alligator leather represents the perceptual upgrade, with natural texture that dialogues perfectly with the satin-finished stainless steel case.

How do you change the strap on the Oris ProPilot 01 798 7773 4284?

The strap is replaced by removing the two spring bars that connect the rings to the case lugs. Use a dedicated spring bar tool, gently pushing towards the case centre to release the bars from their seats. Subsequently, align the new strap with the lugs and reinsert the spring bars. This operation requires approximately 2 minutes. If you prefer to avoid risk, entrust the operation to Atelier Casati Milano.

Which aftermarket straps are compatible with the ProPilot 01 798 7773 4284?

Any strap with a 20 mm lug width is compatible with the ProPilot. milanostraps.it offers a curated selection of artisanal straps in leather, NATO, and rubber, all available in the 20 mm size and customisable according to your chromatic and constructive preferences. All proposed straps have been tested to guarantee compatibility and construction quality.

How long does a leather strap last on the ProPilot 01 798 7773 4284?

A quality leather strap (vegetable-tanned or shell cordovan) has an average lifespan of 3-5 years with moderate daily wear. Longevity depends on exposure to humidity, perspiration, UV rays, and frequency of use. A strap dedicated to aviation, worn discontinuously, can last 7-10 years. The natural patina of leather improves over time, conferring character to the strap. Regular cleaning and annual conditioning significantly extend 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