IWC Calatrava R820AD C.8541B "Jumbo" 36.5mm 1969

This beautifully preserved IWC Calatrava R820AD from 1969 is housed in a jumbo 36.5 mm stainless steel case with a silver sunburst dial and sharp dauphine hands. A timeless, understated dress watch that captures the elegance of late-’60s Swiss watchmaking.

Well-proportioned and classic, this piece features a screw-down case back, original fish-logo crown, and IWC’s in-house automatic Caliber 8541. A clean and refined vintage piece, freshly serviced and ready to wear.

DIAL:

• Original silver sunburst dial in excellent preserved condition

• Applied large IWC logo and printed cursive International Watch Co. script

• Original sharp dauphine hands and crayon-like faceted baton markers

• Applied minute dots around the dial’s periphery

CASE:

• Stainless steel case in excellent condition, professionally polished while retaining sharp edges

• 3-body case with screw-down case back and original IWC fish-logo crown

• 36.5 mm (without crown) / 45.0 mm (lug-to-lug) / 11.5 mm thick

• Year: 1969

• Reference: R820AD

• Case Serial: 1916538

MOVEMENT:

• IWC Caliber 8541B - automatic with Pellaton winding system

• 21,600 A/h, 40-hour power reserve

• Freshly serviced 04/2025

• Accuracy: -1.0 sec/day

• Movement Serial: 1944878

STRAP & BUCKLE:

• Aftermarket black ostrich leg leather strap (19 mm lug width)

• Aftermarket stainless steel IWC-signed buckle• Comes with a black wooden box + silica gel

AFTERCARE PACKAGE:

• Comes with a black wooden box + silica gel

• Free PolyWatch kit (for acrylic crystal only)

• 1-month warranty (non-user damage)

• Warranty card included with full service history

• Exclusive repair service post-warranty

• 7-day return policy for peace of mind

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Specifics

Maker: IWC

Model: Calatrava

Year: 1969

Case Material: Stainless Steel

Reference: R820AD

Movement Serial number: 1944878

Case Serial number: 1916538

Caliber: C.8541

Diameter: 36.5mm

Lug to lug: 45.0mm

Lug width: 19.0mm

Thickness: 11.5mm

Lume: NIL

Strap: Aftermarket Black Crocodile Leather

Box and papers: NIL

Accuracy: -1.0s/Day

Movement type: Automatic

Crystal: Original IWC Domed Acrylic

Crown: Original IWC Fish Logo

Last service: April 2025