IWC Calatrava Jumbo R804A C.8541 36.5mm 1965

A rare and well-preserved example of the IWC Calatrava R804A, notable for its Jumbo 36.5mm case, larger than most men’s watches of the era. This reference from 1968 features a high-polish round case with sharp lugs and houses the robust automatic Caliber 8541 movement. Paired with a near-flawless white sunburst dial with elegant dauphine hands and fine applied markers, the watch offers a timeless and classy design. Perfect for everyday wear or dressing up for the more important occasions.

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 Cal.8541 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 white sunburst dial in outstanding condition
• Sharp dauphine hands with polished finish
• Applied steel indices with black inserts and raised circular minute markers
• Applied crisp "International Watch Co. Schaffhausen" script

CASE:

• 36.5mm jumbo size, polished to mint condition
• 44.0mm lug-to-lug / 18.0mm lug width / 9.0mm thickness
• High-polish finish with sharp-edged lugs, professionally detailed
• Original IWC-signed fish logo crown at 3 o’clock

CASEBACK:

• Press-fit caseback with elegant factory brushing
• Clean surface with minimal tool marks

MOVEMENT:

• IWC Caliber 8541 – Automatic with Pellaton winding system
• Date set by moving minute hand between 9pm and 12am repeatedly
• 23 jewels / 40-hour power reserve / 19,800 vph
• Movement freshly serviced in excellent condition

STRAP AND BUCKLE:

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

AFTERCARE PACKAGE:

• Comes with a sleek black presentation box + silica gel
• Complimentary PolyWatch polishing kit (for acrylic crystal)
• 6-month warranty (non-user damage only)
• Warranty card included
• Access to 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: R804

Case Serial Number: 1741269

Movement Serial Number: 1743757

Caliber: Cal.8541

Power Reserve: 40 hours

Accuracy: ~0s/day

Diameter: 36.5mm

Lug to Lug: 44.0mm

Lug Width: 18.0mm

Thickness: 9.0mm

Lume: NIL

Bracelet: Handmade leather strap

Buckle: Aftermarket IWC signed buckle

Box and Papers: NIL

Movement Type: Automatic

Crystal: Original IWC domed acrylic

Crown: Original IWC signed fish logo crown

Last Service: July 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 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.