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Pre-Owned Patek Phillipe Perpetual Calendar Moonphase Chronograph 40930073/AS05673

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Of course, there's no arguing that Patek Philippe sits atop the watchmaking pinnacle as the finest manufacture in the world. But while Patek is world renowned for its superb in-house movements, it should be noted that up until fairly recently, even its complicated chronographs used source Swiss movements from the likes of Lemania, and before that, Valjoux. Of course, these were superbly finished versions of ebauch's, but this is old-school watchmaking in a nutshell: A maison such as Patek would source the parts from the very best manufacturers, and in the 1980s and 1990s, that was Lemania. The reference 3970E we have here is a waterproof version of a perpetual calendar chronograph produced between 1986 and 2004, preceded by the ref. 2499 and succeeded by the ref. 5970. And it's powered by the Calibre CH 27-70 Q manually-wound movement Patek's modified version of the Lemania Calibre 2310. Hand-finished and beautiful, it formed the basis of not only this watch, but also the Calibre 321 used in the first Omega Speedmatsers. What is this notable movement powering? Namely, a dial with an incredible amount of information, conveyed in an elegant form that only a maison such as Patek Philippe could design: On its beautiful silvered dial with white gold, applied indices, there are dual day and month displays beneath the 12 o'clock index; a combined 30-minute totalizer and leap year indicator at 3 o'clock; a combined date wheel and moon phase indicator at 6 o'clock; and a combined running seconds and 12-hour totalizer at 9 o'clock. (And yes, the 3970E also tells the time.) Housed in a polished, white gold 36mm case with round pushers, this particular 3970 is an E version for tanche, or waterproof meaning it has a screw-down case back. Pointed baton hands, a deployant clasp on its signed black alligator leather strap and a production date of 1995 indicate a 4th-series ref. 3970E, the last production run before the watch was succeeded by the ref. 5970. Beautifully sized with a gorgeous dial and featuring one of the most notable chronograph movements in history, we'll be damned if this isn't one of the most stunning complicated watches we've ever had the pleasure to offer. OVERALL CONDITION The case is in excellent condition overall showing light signs of wear consistent with age and use. Satin silver dial with recessed sub registers and applied white gold indices is in as-new condition with matching 'pencil' handset. Sapphire exhibition caseback. 18K signed crown.

Delivery & Returns

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

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.

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