Hi Bob. I put in one of these two years ago and it's been working perfectly ever since. Keeps time as you would expect from a quartz clock. The face is identical to the original one, except that it does say, in small typeface, "quartz". I will try to remember taking a photo in the near future.
Since I am personally not a stickler for detail/originality, I am quite happy with this clock for the time being. Still, I would like to have my original rebuilt one of these days, but at the moment it is not a high priority.
Cees Klumper in Amsterdam
'69 white 280 SL automatic