9051aRS

PATEK PHILIPPE STEEL HOBNAIL QUARTZ ELLIPSE, REF. 3931A

Patek Philippe quartz ref. 3931G, made circa 1988

Specifications Story behind the watch
Trustpilot

Watch specifications

Reference Number
3931A
Production Year
Circa 1988
Original Date of Sale
Circa 1988
Size
34 x 28 mm
Material
Stainless Steel
Dial Color
White Roman numerals
Watch Movement
Quartz E27
CSKU
9051

Story behind the watch

This is surprisingly one of the rarer of all gent’s Patek Philippe Ellipse references. Made from 1986-1990, there are less than a dozen known to exist at this point in time. Its distinctive features include the classic Roman dial with a stainless steel case decorated with a hobnail bezel. It is a quintessential Patek Philippe and beautifully aged.

Collectability Guarantee

Every timepiece is authenticated and backed by our in-house expertise.

Secure transactions

Payments are handled safely with concierge support at every step.

Worldwide delivery

Insured global shipping ensures each watch arrives ready to wear.

How it works

Our team of watch experts is dedicated to ensuring you receive the best possible service buying your luxury timepiece.

1

Find a Patek Philippe you like

Explore the available Patek Philippe watches on the website.

2

Know the watch

Learn about the history, craftsmanship, and value of the watch.

3

Make the purchase

Once you've decided, complete the secure purchase.

4

Receive the watch

You will receive your watch securely packaged in our box, complete with its accompaniments.

Expert Knowledge

Led by Patek Philippe expert John Reardon, we guide collectors in making confident vintage watch decisions.

Award-Winning Service

Winner of WatchPro 2024 Vintage and Pre-Owned Retailer of the Year.

Transparent Process

We make buying and selling vintage watches simple, transparent, and authentic.

Rarity and Provenance

We offer properly vetted, historically significant watches for serious collectors.

Buy a watch

Every timepiece is personally inspected and authenticated by our founder, John Reardon, one of the world’s leading experts on Patek Philippe. The case, dial, movement, and, when applicable, the buckle and bracelet are examined before a watch is offered for sale. Whenever possible, we include the original Certificate of Origin or an Extract from the Archives. If a watch is offered without one, we will always explain why - for example, if Patek Philippe declined to issue an Extract from the Archives because a dial was changed at some point in the watch's history.

We take pride in offering watches in the condition in which we acquired them. We avoid unnecessary interventions such as polishing or dial refinishing. If a movement requires repair, it is serviced by our select group of trusted specialists, including Patek Philippe-trained watchmakers.

Yes. We guarantee the authenticity of every Patek Philippe timepiece we sell. If a watch purchased from us is ever determined to have a previously unknown issue, please contact us to discuss the issue. This authenticity guarantee lasts two years from the date of sale and applies only to the original purchaser. It covers the watch as a whole, not individual components. All trademarks mentioned are the property of their respective owners. Collectability is an independent business and is not an authorized Patek Philippe dealer nor affiliated with Patek Philippe SA.

Every watch purchased from Collectability is guaranteed to be in working order for one year from the date of sale. If it stops functioning properly during that period (and hasn’t been damaged or mishandled), we’ll repair or adjust it free of charge.

Vintage and pre-owned watches should never be considered water resistant, even if they were originally designed as such. We recommend avoiding exposure to water, shocks, or magnetic fields.

For most timepieces, with the exception of consigned pieces, if you decide your timepiece is not right for you, you can return it within three business days for a full refund provided that the timepiece and its accompaniments are in the exact condition they were shipped to you. We’ll issue your refund upon safe receipt of the watch and any or all accompaniments.

We accept secure payments via bank transfer only.

Yes. All shipments are insured until they reach you via a trusted courier.

Returns are accepted within three business days of delivery for a full refund. We’ll provide a prepaid label and issue the refund upon safe receipt of the watch.

We’ll arrange immediate repair or adjustment under the terms of our one-year working guarantee.

Within the first year, repairs within reason are covered. After this period, we can coordinate servicing with our watchmaking partners at your expense, with an estimate provided before any work begins.

Yes. Many clients choose to have us coordinate ongoing maintenance or service.

Similar watches

Shop All Watches

Latest videos

Browse All Content
Welcome to Collectability: who we are and why we’re here

Videos

Welcome to Collectability: who we are and why we’re here
A miniature enamel masterpiece by Carlo Poluzzi

Videos

A miniature enamel masterpiece by Carlo Poluzzi

Learn with us

Browse All Content
The Story Behind: Patek Philippe Ref. 5212A

Learn

The Story Behind: Patek Philippe Ref. 5212A

One of Collectability’s favorite modern Patek Philippe watches is the ref. 5212. Known as the Calatrava Weekly Calendar, it was…
The Patek Philippe “Eccentric Seconds” watches

Learn

The Patek Philippe “Eccentric Seconds” watches

A study of the references 5000, 5028, 5026, 6000 and 6006 Few Patek Philippe references are as quietly distinctive as…
Catching Up: The Patek Philippe Reference 2526

Learn

Catching Up: The Patek Philippe Reference 2526

INTRODUCTION When my original in-depth study of the Patek Philippe ref. 2526 was published on May 9, 2024, my goal…

Testimonials

Tom P ○

“Just received a watch this morning purchased through Collectability. From start to finish it was a pleasurable experience and went very smoothly. Collectability definitely has the most interesting and quality curated inventory of vintage Patek Philippe I have seen. 10/10 would recommend.”

JH ○

September 2025

“Downsizing my life in many ways big and small. Checked several sources looking for a reputable buyer of Patek Philippe. John’s name came to the top of the list as an expert. I reached out to him and he offered a very fair price (I had gone to other dealers and researched online)He offered several w…”

Doc ○

July 2025

“I’ve had the pleasure of purchasing two vintage Patek Philippe watches from Collectibility, and I couldn’t be more satisfied with the entire experience. From the initial inquiry to post-purchase support, the service provided has been nothing short of exceptional. John Reardon is a true authority wh…”

Marc ○

June 2025

“I bought a watch and John and Tania could not have been better to deal with.”

Gerhard Z ○

June 2025

“John is THE authority on everything Patek Philippe! He is not only trustworthy, but also a genuine pleasure to talk with!”

Peter S ○

May 2025

“I am a New York City physician and distinctly honored to have recently purchased several exquisite, rare, pristine and well-priced Patek Philippe timepieces and accessories from John Reardon, founder of Collectability. John is the real deal you can't find anywhere else when it comes to being knowle…”

David T ○

April 2025

“I just opened the box with the Patek Philippe watch and paperwork from Collectability. Not only is the watch stunning, but the quality of the packaging and the overall presentation was the best I have ever seen. I am extremely impressed. You really made the buying experience absolutely first class.…”

Robert M ○

March 2025

“John was very patient. I thought I knew a lot about Patek Philippe since I worked in an authorized dealership many years ago. I was wrong. As a lifelong Patek fan, I really appreciate the patience and assistance. My watch is amazing. Every aspect of my purchase exceeded expectations. Thank you!”

BLN ○

February 2025

“Collectability’s integrity, knowledge and service elevate an enjoyable hobby to a passionate quest for scholarship and collection. I have dealt with the team at multiple occasions over the years, and what I found truly remarkable is the combination of generosity in sharing knowledge and unmatched e…”

Andres N ○

January 2025

“You [John Reardon] and your team are really amazing and some of us are very fortunate that we not only have been able to get some amazing Patek Philippe pieces through you, but we have learned a lot as part of the process.”

Marc B ○

December 2024

“Over the past 4 years, I have bought and sold over a dozen Patek Philippe timepieces with Collectability. John Reardon and Tania Edwards are not only world-class experts when it comes to Patek Philippe, they are also world-class individuals. They set the bar high for everything from the educational…”