IWC · Big Pilot

Strap for Big Pilot’s Watch Annual Calendar Edition Le Petit Prince White Gold

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm
Lug width22 mm
Case diameter46 mm
ReferenceIW5027-03 (aka: IW502703)
FamilyBig Pilot
MovementIWC caliber 52850 Hours, Minutes, Small Seconds | Date, Day, Month, Annual Calendar | Power Reserve Indicator
CaseWhite Gold

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 Pilot IW5027-03 (aka: IW502703)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Big Pilot IW5027-03 (aka: IW502703), seen from the bench

The Big Pilot IW502703 is equipped with the IWC 52850 caliber featuring an annual calendar, day-date-month indication, and power reserve. It presents hour, minute, small second, and power reserve functions. 22mm lug width for the strap.

Frequently asked questions

What is the lug width of the IWC Big Pilot IW5027-03?

The IWC Big Pilot IW5027-03 features a lug width of 22mm, measured between the internal lugs. This width is specific to this model and ensures compatibility with all straps manufactured to this specification. To verify the measurement accurately, position a calibrated ruler on the inner lugs: the distance between the two surfaces corresponds precisely to 22mm.

Which strap should I choose for the Big Pilot IW5027-03?

The Big Pilot IW5027-03 in white gold pairs ideally with alligator straps in black or deep brown, vegetable-tanned calf leather, shell cordovan, or technical rubber. Alligator delivers formal elegance, vegetable-tanned calf develops a noble patina over time, cordovan offers tactile luxury, whilst rubber emphasises the aviation character of the dial. Avoid saturated colours: the Big Pilot communicates through material sobriety.

How do I change the strap on my Big Pilot IW5027-03?

To change the strap, obtain a spring bar removal tool with fine tips. Locate the metal pins connecting the strap to the lugs. Insert the tool's tip into the pin's slot and press gently outward to free one end of the lug. Repeat for the opposite end. Insert the pins into the new strap in reverse order. Exercise caution to avoid scratching the white gold case during this operation.

Can I use an aftermarket strap on the IWC Big Pilot IW5027-03?

Yes, provided the strap is manufactured for 22mm lug width. All straps with an internal width of 22mm are compatible with the Big Pilot IW5027-03. We recommend artisanal straps that respect the case's proportions: calibrated thicknesses, robust lugs, and finishes that dialogue with white gold. Always verify leather quality and stitching standards before purchase.

How long does a leather strap last on the Big Pilot IW5027-03?

Durability depends on material and usage intensity. An artisanal alligator or vegetable-tanned calf strap, worn daily, maintains structural integrity for 3-5 years. Shell cordovan exhibits superior longevity (5-7 years) due to material density. Technical rubber resists 2-3 years with intense wear. Primary wear occurs at the buckle and loaded keeper: plan for revision or replacement after 18-24 months with regular wear.

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