If you happen to have the case number for the Zenith A386 at the Watches of Knightsbridge March 28 2020 sale, please let me know.

I'm trying to keep up the Zenith A386 database...thanks OF

 

Scratching my head here. In the description they state "numbered 70xDxxx". On the case back photo provided there is not any sign of a serial number engraving. A few faint scratches show but nothing even close to a digit.

 

Thanks @wristpirate
If anyone else has more numbers (or is or knows the new owner), give a shout

 

I reached out and they declined to provide, so it sounds like there is a full serial visible in person, though as you say @wristpirate, there doesn't look to be any visible...