Fairphone has one, and they encourage second hand buyers to verify whether the device hasn’t been listed as stolen:
Also, if you haven’t done so, contact your provider to report the theft. Most countries operate some sort of IMEI blacklist and most providers will pass on the IMEI numbers of stolen phones to such a list.
Probably in the Fairphone Software overview (see interactive clock):
The behaviour has, however, been changed in one of the updates. But I agree, it would be interesting to know whether there is a way to change this (as long as people realise the date is not an indication for warranty etc.)