The very rare Earth model had I believe cloth seats but was based on the Positiv. The two main versions were the top of the range Electron with satnav and bose sound and the Positiv without a satnav and a standard sound system. Happy to be corrected.
How many left suggests there were only 13 sold! And looks like my12 only
Here is the 2013 Models Edition 1. Not much difference between this and the last of the Amperas, main things that I know of are the charge flap became totally manual bu pressing in the flap and it popping open and there seems to be a change to the Satnav as the early ones can no longer be updated but the later ones could have been at one point (not sure if this is still the case).
If its the one on Autotrader then it looks like a my12 positiv. The rare Earth had cloth on the seats, otherwise it was a Positiv according to the specs. It was a couple of thousand cheaper than the Positiv at the time.