IWC Calatrava Mid-Sized Jumbo R818AD C.8541B 35.0mm 1973

This beautifully preserved IWC Calatrava R818AD from 1973 is housed in a 35.0 mm stainless steel case with a radiant white sunburst dial and elegant pencil-style hands. A timeless, understated dress watch that captures the elegance of vintage Swiss watchmaking.

Well-proportioned and classic, this piece features a brushed and polished caseback, original stamped fish logo crown, and IWC’s in-house automatic Caliber C.8541B. A clean and refined vintage piece, freshly serviced and ready to wear.

DIAL:

• Original white sunburst dial in excellent preserved condition with light natural patina

• “International Watch Co. Schaffhausen” printed at 12 o’clock

• Pencil-style mirror-polished hands with black inserts, matching stick hour markers

• Subtle minute track framing the dial

CASE:

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

• Mirror-polished finish, slim profile, original fish-logo signed crown

• 35.0 mm (without crown) / 41.5 mm lug-to-lug / 10.0mm thickness

• Year: 1973

• Reference: R818AD

• Case Serial: 2084835

MOVEMENT:

• IWC Caliber C.8541B – Automatic with Pellaton winding system and quickset date

• Frequency: 19,800 vph, Power Reserve: ~44 hours

• Freshly serviced April 2025

• Accuracy: -1.0s/day

• Movement Serial: 2040595

• Second hand slips due to age and originality

STRAP & BUCKLE:

• Aftermarket black lizard leather strap (18mm lug width)

• Aftermarket stainless steel buckle

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

Specifics

Maker: IWC

Model: Calatrava Automatic Date

Year: 1973

Case Material: Stainless Steel

Reference: R818AD

Movement Serial number: 2040595

Case Serial number: 2084835

Caliber: C.8541B

Diameter: 35.0mm

Lug to lug: 41.5mm

Lug width: 18.0mm

Thickness: 10.0mm

Lume: NIL

Strap: Black lizard leather strap

Box and papers: NIL

Accuracy: -2.0s/day

Movement type: Automatic

Crystal: Original IWC Domed acrylic

Crown: Original Stamped IWC fish logo

Last service: May 2025

Free tracked shipping via SingPost. Delivery within Singapore in 2–3 working days. International shipping may take 4–16 working days depending on destination.

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-purchatse.