IWC Calatrava R810A C.8541 35.0mm 1966

The ultimate all rounder piece, with its clean faceted lugs and pristine satin dial in perfect condition. Paired with the sharp steel hands and matching steel indices, making the ultimate watch for everyday use or even the more dressier occasions. An absolute classic must have for every discerning collector.

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.8541B in this R810A 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 (no lume, crisp contrast)

• Steel faceted syringe‑shaped hands matching perfectly with the faceted steel indices

• Crisp applied cursive IWC logo at 12 and original wording at 6

CASE:

• Classic Calatrava dress‑watch styling with slim bezel and elegant faceted lugs

• 35.0mm diameter (excluding crown) / 41.0 mm lug‑to‑lug / 10.0mm thickness

• Professionally polished with sharp angular edges retained

• Original IWC crown at 3 o’clock with fish logo

CASEBACK:

• Snap‑on caseback, with a mix of brushed and polished surfaces

• Clean condition, professionally polished to perfection

• Comes with plastic protective sticker as shown

MOVEMENT:

• IWC Caliber C.8541B – automatic with Pellaton winding system

• 21 jewels / 46 hour power reserve / 19,800 vph frequency

• Movement freshly serviced and in excellent condition

• Last serviced: January 2026

• Accuracy: +1.0s/day

STRAP:

• Handmade Black Crocodile Leather Strap, 18mm lug width

• Aftermarket IWC-signed stainless steel buckle

AFTERCARE PACKAGE:

• Comes with a black wooden box + silica gel

• Free PolyWatch Acrylic Crystal Polishing kit

• Warranty/Service history card for easy future sale

• 1‑Month warranty (non‑user damage)

• Exclusive Post‑warranty service access

• 7‑day return policy for peace of mind

SPECIFICS:

Maker: IWC (International Watch Co.)

Model: Calatrava 

Reference: R810

Case Material: Stainless steel

Year of Manufacture: 1966

Case Serial Number: 1794617

Movement Serial Number: 1767577

Caliber: IWC Cal. 8541 automatic Pellaton movement

Movement Type: Automatic

Power Reserve: ~46 hours

Accuracy: +1.0s/day

Diameter: 35.0 mm

Lug to Lug: 41.0 mm

Thickness: 10.0mm

Lug Width: 18 mm

Lume: None

Strap: Handmade black crocodile leather strap

Box and papers: NIL

Crystal: Domed acrylic, IWC‑signed

Crown: IWC signed with fish‑logo

Last Service: January 2026

Free express tracked shipping with signature upon delivery. Delivery within Singapore in 1-2 working days. International shipping may take 2–12 working days depending on destination. Do note respective custom duties might apply which includes the recent US tariffs and are the buyer's responsibility.

Do note that for US 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: Algeria, Nepal, Pakistan, Russia, Vietnam, Iran

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.