Hello,

We all know the problem of "serviced watches" on eBay. Have a look at the timegrapher results of this one:

Vintage 1952 Omega 14k SOLID GOLD Watch C 351 Bumper Automatic Serviced Runs ++ https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.fr/ulk/itm/352200876277

There is probably an error, but if these are really the timegrapher results after the service and with the correct lift angle...

 

Amplitude appears to be marginal. Serviced? Partly run down? Weak or incorrect mainspring? How many positions was the test? Was this the Timegrapher result for the subject watch?

 

I was mainly concerned by the amplitude - because it is WAY too low to be decent, even if there is a small mistake in the lift angle. But obviously, as you pointed, there are or could be other issues.

As it has been discussed here several times, timegrapher results in one position at full wind are far from been enough to give an idea of the behavior of the watch.
Nevertheless, when you give a pic of timegrapher results for a serviced watch, it should at least look good!