Received today one of this
http://www.ebay.com/itm/142463366624 u1252a. Meter is almost like new, beside some light wiping marks at lens. I don't even found any dust under buttons and rotary switch.
Firmware - 0.91, date - 7.01.09 He also have some u1273, u1272.
Power on with the "dual" button pressed shows firmware version on primary and date on secondary display. This is the date of production?
Also I don't find no traces in "user's and service guide" of any power-up option like "null", mentioned above in the thread.