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Oris · ProPilot

Strap for Big Crown ProPilot GMT Rega Fleet Airbus Helicopters H145 - HB-ZQM

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-ZQM-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

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

The ProPilot is equipped with the Oris Caliber 798 with hour, minute, second, adjustable 24-hour hand and date functions. The watch features 20mm lugs and is targeted at the civil aviation sector. The movement offers dual time zone indication through the dedicated fourth hand.

Frequently asked questions

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

The lug width is 20mm. This measurement is essential for selecting compatible straps. Ensure that the strap you choose has exactly 20mm lug width to guarantee correct fit and proportion to the 41.50mm case diameter.

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

It depends on your intended use. For formal elegance, we recommend alligator with vegetable tanning in cognac tones. For everyday versatility, grey taupe calf leather. For practicality and sports, a technical black rubber strap. A navy NATO exalts the aviatory heritage without compromising robustness.

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

Strap change is accomplished via lug removal. Use a spring bar tool to compress the lateral springs and free the lugs from the case. Insert the same lugs into the new strap and position everything on the case. The procedure requires care to avoid damaging the brushed steel finish.

Is a 20mm aftermarket strap compatible with this model?

Yes, any strap with 20mm lugs is compatible. However, verify that the strap is crafted by artisans who understand proper proportions for a 41.50mm case. Generic straps may present inadequate lengths or finishes that fail to enhance the ProPilot's aesthetics.

How long does a leather strap last on a regularly worn wristwatch?

A quality alligator or calf leather strap with vegetable tanning typically lasts 3-5 years under daily wear conditions. Longevity depends on climate, sun exposure, frequency of wear, and maintenance. Keeping the strap dry and stored away from heat sources significantly extends its operational 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