IWC Calatrava Jumbo R647A C.8531 36.5mm 1965

This beautiful example from 1965 showcases a clean silver dial, paired with sharp dauphine hands that catch the light effortlessly. Housed in its desirable 36.5mm case and powered by IWC’s legendary Pellaton automatic C.8531, it offers both mechanical pedigree and everyday wearability. With its balanced proportions and refined finishing, this is a standout vintage dress watch that wears as well today as it did nearly 60 years ago.

In addition, this timepiece comes freshly serviced with all parts laid out by our professional watchmaker for all to see in the images above. Little to no other dealers do this and it’s a testament to full transparency here at Montre D’or. With the C.8531 inside running excellently as shown in the timegrapher reading above, just like it was when it left the factory nearly half a century ago.

DIAL:

• Original silver sunburst dial in excellent condition
• Dauphine hands with no lume, clean and sharp
• Applied hour indices, beautifully faceted to catch the light
• Original IWC cursive logo and crisp original wording
• Domed acrylic crystal

CASE:

• Classic Calatrava-style round case design
• 36.5mm Diameter (excluding crown) / 45.0mm Lug-to-lug / ~10.0mm Thickness
• Professionally polished with all sharp edges intact
• Original unmarked crown at 3 o’clock

CASEBACK:

• Snap-on caseback, with original finishing pattern
• Professionally polished to perfect vintage condition
• Comes with plastic protective sticker as shown

MOVEMENT:

• IWC C.8531 – Automatic (Pellaton winding system)
• 21 Jewels / ~44 Hours Power Reserve / 19,800 BPH
• Time-only movement (no date)
• Movement freshly serviced and in excellent condition

STRAP:

• Handmade leather strap, colour and design can be changed upon request depending on availability
• Aftermarket IWC stainless steel buckle

AFTERCARE PACKAGE:

• Comes with a black presentation box + silica gel
• Complimentary PolyWatch crystal polishing kit (for acrylic crystal)
• 6-month warranty (covers non-user damage only)
• Guarantee Certificate with full service details included
• Access to our exclusive post-warranty repair services
• 7-day return policy for peace of mind

SPECIFICS:

Maker: IWC

Model: Calatrava

Year: 1965

Case Material: Stainless Steel

Reference: R647A

Movement Serial Number: 1699073

Case Serial Number: 1744193

Caliber: C.8531

Diameter: 36.5mm

Lug to lug: 45.0mm

Lug width: 18.0mm

Thickness: ~10.0mm

Lume: NIL

Strap: Handmade leather strap

Box and papers: No

Accuracy: ~0s/day

Movement type: Automatic

Crystal: Domed acrylic crystal

Crown: Original unmarked crown

Last service: August 2026

Free express tracked shipping provided. Delivery within Singapore in 1-2 working days. International shipping may take 2–12 working days depending on destination and will be shipped via FedEx/UPS/Aramex

Do note respective custom duties might apply which includes the recent US tariffs and are the buyer's responsibility

Do note that for US and South America bound shipments the PolyWatch polishing kit will not be included in order to mitigate customs delay due to new customs requirements

Countries that we do not ship to: Afghanistan, Belarus, the Central African Republic, Chad, Cuba, the Democratic Republic of the Congo, Eritrea, Iran, Iraq, Israel, Lebanon, Libya, North Korea, Oman, Pakistan, Russia, Somalia, South Sudan, Syria, Ukraine and the Crimea, Donetsk, and Luhansk regions of Ukraine.

This is a vintage timepiece and water resistance is not guaranteed. Please avoid contact with water or moisture. Store the watch with dry tissue or silica gel to preserve its condition. We are not liable for water damage post-purchase.