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- Analog Shift
- Beta 21
Specification
- Product Code 40930169
- Manufacturer Product Number 40930169/AS06950
- Condition Certified Pre-Owned
- Guarantee Analog Shift 1 Year Mechanical Guarantee
- Category Pre-Owned Watches
- Brand Pre-Owned Patek Philippe
- Watch Markers Luminous
- Water Resistant Not Guaranteed
- Recipient For Him
- Movement Electric
- Case Material White Gold
- Dial Color Blue
- Strap Material Leather
- Diameter 43mm
- Brand Collections Beta 21














Pre-Owned Patek Philippe Beta 21 40930169/AS06950
$84,950.00Items in your bag will be held for 1 hour

- Free Delivery
- View our Returns Policy
- Authorized Luxury Retailer
- Gift Wrap Available In-Store
for this item is
- Product Code 40930169
- Manufacturer Product Number 40930169/AS06950
- Condition Certified Pre-Owned
- Guarantee Analog Shift 1 Year Mechanical Guarantee
- Category Pre-Owned Watches
- Brand Pre-Owned Patek Philippe
- Watch Markers Luminous
- Water Resistant Not Guaranteed
- Recipient For Him
- Movement Electric
- Case Material White Gold
- Dial Color Blue
- Strap Material Leather
- Diameter 43mm
- Brand Collections Beta 21
WHY WE LOVE IT
The 1969 introduction of the Seiko Astron, the world’s first commercially available quartz wristwatch, sent tremors throughout the industry.
In a struggle to keep pace with the new technology, the big Swiss watch manufacturers banded together to develop their own quartz movement, which could be used by watches from the different brands. The resulting production movement, the Beta 21, was an electronic caliber featuring a quartz crystal beating at 8.192 Hz. Reduced to 256 Hz to drive a vibration motor, the movement featured a sweep seconds hand, rather than the more well known “ticking” seconds of conventional quartz calibers.
Despite the massive R&D budgets of the Swiss conglomerate that developed the Beta 21, just 6,000 movements were produced before the project was scrapped. Certain watchmakers, however, produced their own versions of the Beta 21 and continued production for some time.
Some of the more significant Beta 21-based models were those produced by none other than Patek Philippe, a manufacturer well known for its mechanical calibers. The Reference 3597 that we have here, dating to 1972, is housed in a 43mm 18K white gold case with hooded ‘T’ lugs and a signed crown. It features a handsome, sunburst blue ‘Sigma’ dial with applied tritium indices, a matching handset, an outer minute track, and a recessed date window at 3:00. Powered by the Beta 21 electronic quartz movement, it comes paired to a signed, navy blue alligator leather strap with a signed white gold pin buckle and extensive documentation.
Unabashedly 70s while relatively restrained, this is one of the finest examples of Patek’s Beta 21-based timepieces that we’ve ever come across. What’s more, it comes with extensive documentation, pamphlets, a Certificate of Origin from the Patek dating its manufacture to 1972, and an Extract from the Archives confirming its sale in 1973.
Whether you’re a dedicated Patek collector or a scholar of horological history — or both! — this is a timepiece not to be missed.
OVERALL CONDITION
The case is in very good condition overall showing normal wear consistent with age and use. Luminous blue 'sigma' dial with applied white gold and Tritium indices is in very good condition, showing patination throughout with matching service handset showing matching patination. Unsigned crown.
Standard Delivery (Est 1-3 Days) - Free
Our secure shipping service delivers Monday - Saturday between 8:00 a.m. and 6:00 p.m. For security purposes, every delivery requires an adult signature; Mayors does not deliver to P.O. boxes nor third party forwarding services. To find out more about delivery, click here. Tracking information is available upon request.
If you have any questions or concerns regarding your order, Mayors’ E-Commerce team can be reached at 1-800-4-MAYORS (1-800-462-9677), option 1, during the following times (Eastern Time):
- Monday - Saturday: 9:00 a.m. – 7:00 p.m
- Sunday: 9:00 a.m. – 5:00 p.m
- Closed Easter Sunday, Thanksgiving Day and Christmas day
Alternatively, you can email the E-commerce team at ecommerce@mayors.com.
Return Policy
Our commitment to you does not end at delivery. We offer the following return services to make your experience as pleasant as possible.
10-Day Returns For Timepieces:Timepieces purchased online can be returned or exchanged within 10 days from when they are shipped or collected.
30-Day Returns For All Other Purchases:All other online purchases can be returned or exchanged within 30 days from when they are shipped or collected.
On presentation of the original receipt, your purchases may be returned or exchanged at any of our store locations. Alternatively, you may elect shipping to our facility with all the original paperwork. All refunds must be credited to the same tender used for the original purchase. To return the online purchases through secure shipping service, please contact our client service team who will provide you the shipping label.
All returns or exchanges must be in new, unworn condition, with no scratches or markings, not sized or adjusted and in their original packaging and with warranty cards / certificated and instruction booklets.