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Vacheron Constantin Platinum Perpetual Calendar Diamond & Sapphire Watch Ref. 43031

Vacheron Constantin Platinum Perpetual Calendar Diamond & Sapphire Watch Ref. 43031

Vacheron Constantin Platinum Perpetual Calendar Diamond & Sapphire Watch Ref. 43031

$85,000 USD
 
Audemars Piguet Platinum Tourbillon Minute Repeater Ref. 25948PT

Audemars Piguet Platinum Tourbillon Minute Repeater Ref. 25948PT

Audemars Piguet Platinum Tourbillon Minute Repeater Ref. 25948PT

$140,000 USD
 
Patek Philippe Platinum Second Series Perpetual Calendar Watch Ref. 3940, Circa 1988

Patek Philippe Platinum Second Series Perpetual Calendar Watch Ref. 3940, Circa 1988

Patek Philippe Platinum Second Series Perpetual Calendar Watch Ref. 3940, Circa 1988

$158,000 USD
 
A. Lange & Sohne Platinum 1815 Tourbillon Watch Ref. 730.025

A. Lange & Sohne Platinum 1815 Tourbillon Watch Ref. 730.025

A. Lange & Sohne Platinum 1815 Tourbillon Watch Ref. 730.025

$120,000 USD
 
Patek Philippe Platinum Grand Complication Ref. 5208

Patek Philippe Platinum Grand Complication Ref. 5208

Patek Philippe Platinum Grand Complication Ref. 5208

"Price upon request"
 
Patek Philippe Platinum Perpetual Calendar Minute Repeater Ref. 5307

Patek Philippe Platinum Perpetual Calendar Minute Repeater Ref. 5307

Patek Philippe Platinum Perpetual Calendar Minute Repeater Ref. 5307

"Price upon request"
 
Rolex Platinum and Diamond Cover Watch

Rolex Platinum and Diamond Cover Watch

Rolex Platinum and Diamond Cover Watch

$65,000 USD
 
Cartier Platinum Salmon Dial Watch Ref. 1611

Cartier Platinum Salmon Dial Watch Ref. 1611

Cartier Platinum Salmon Dial Watch Ref. 1611

$35,000 USD
 
Cartier Platinum Tank Obus European Watch & Clock, 1926

Cartier Platinum Tank Obus European Watch & Clock, 1926

Cartier Platinum Tank Obus European Watch & Clock, 1926

$100,000 USD
 
IWC Platinum Il Destriero Scafusia Grand Complication Bracelet Watch

IWC Platinum Il Destriero Scafusia Grand Complication Bracelet Watch

IWC Platinum Il Destriero Scafusia Grand Complication Bracelet Watch

"Price upon request"
 
Audemars Piguet Steel & Platinum Royal Oak Perpetual Calendar Watch Ref. 25820SP

Audemars Piguet Steel & Platinum Royal Oak Perpetual Calendar Watch Ref. 25820SP

Audemars Piguet Steel & Platinum Royal Oak Perpetual Calendar Watch Ref. 25820SP

$140,000 USD
 
Patek Philippe Platinum Perpetual Calendar Minute Repeater Watch Ref. 5374

Patek Philippe Platinum Perpetual Calendar Minute Repeater Watch Ref. 5374

Patek Philippe Platinum Perpetual Calendar Minute Repeater Watch Ref. 5374

$875,000 USD
 
Patek Philippe Platinum Grand Complications Minute Repeater Watch Ref. 5207

Patek Philippe Platinum Grand Complications Minute Repeater Watch Ref. 5207

Patek Philippe Platinum Grand Complications Minute Repeater Watch Ref. 5207

"Price upon request"
 
Patek Philippe Platinum Chronograph Watch Ref. 5070P

Patek Philippe Platinum Chronograph Watch Ref. 5070P

Patek Philippe Platinum Chronograph Watch Ref. 5070P

$205,000 USD
 
Audemars Piguet Platinum Square Watch

Audemars Piguet Platinum Square Watch

Audemars Piguet Platinum Square Watch

$12,000 USD
New Arrivals Preview
 
Patek Philippe Yellow Gold Calatrava Ref. 3915 with Original Papers (New Arrival)

Patek Philippe Yellow Gold Calatrava Ref. 3915 with Original Papers (New Arrival)

Patek Philippe Yellow Gold Calatrava Ref. 3915 with Original Papers (New Arrival)

$15,000 USD
 
Cartier White Gold Baignoire Mini Ref. W1518956 (New Arrival)

Cartier White Gold Baignoire Mini Ref. W1518956 (New Arrival)

Cartier White Gold Baignoire Mini Ref. W1518956 (New Arrival)

$8,400 USD
 
Gerald Genta Steel Mickey Mouse Ref. G3712 70th Anniversary Watch with Mother of Pearl Dial (New Arrival)

Gerald Genta Steel Mickey Mouse Ref. G3712 70th Anniversary Watch with Mother of Pearl Dial (New Arrival)

Gerald Genta Steel Mickey Mouse Ref. G3712 70th Anniversary Watch with Mother of Pearl Dial (New Arrival)

$18,500 USD
 
Franck Muller Rose Gold Cintree Curvex Perpetual Chronograph Ref. 6850 (New Arrival)

Franck Muller Rose Gold Cintree Curvex Perpetual Chronograph Ref. 6850 (New Arrival)

Franck Muller Rose Gold Cintree Curvex Perpetual Chronograph Ref. 6850 (New Arrival)

$32,000 USD
 
Patek Philippe Yellow Gold Watch Ref. 3859 with Onyx and Mother of Pearl (New Arrival)

Patek Philippe Yellow Gold Watch Ref. 3859 with Onyx and Mother of Pearl (New Arrival)

Patek Philippe Yellow Gold Watch Ref. 3859 with Onyx and Mother of Pearl (New Arrival)

$26,000 USD
 
Cartier Yellow Gold Tonneau Watch, Circa 1950s with European Watch & Clock Movement (New Arrival)

Cartier Yellow Gold Tonneau Watch, Circa 1950s with European Watch & Clock Movement (New Arrival)

Cartier Yellow Gold Tonneau Watch, Circa 1950s with European Watch & Clock Movement (New Arrival)

$22,000 USD
 
Cartier Two-Tone Panthere Ref. 7669 with Rare Obsidian Stone Dial (New Arrival)

Cartier Two-Tone Panthere Ref. 7669 with Rare Obsidian Stone Dial (New Arrival)

Cartier Two-Tone Panthere Ref. 7669 with Rare Obsidian Stone Dial (New Arrival)

$29,000 USD
Shop all New Arrivals Preview

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Guarantee

Our watches go through a rigorous authentication process in which seasoned experts examine and evaluate the watches. These experts have decades of experience and have authenticated thousands of watches in their lifetime. We guarantee every piece of the watches we offer are 100% authentic. 

CONTACT US

You can reach us by emailing hello@thekeystone.com or call 213-632-9061

We are based in West Hollywood, CA. Please contact us for appointments to view a watch in person. 

We are not authorized sellers of the brands listed on our site. We sell vintage and pre-owned product.

Stay in touch.

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