Here we have a Commodore 710, quite a rare beast, these were only sold for 2 years between 1982 & 1984. Listed on ebay as not working it also is sadly missing it's keyboard, these were detachable on this model of PET. Here is a few pictures taken just after unpacking. Significant difference on the back to other models of PET, there is no user port but there is an RS232 port and an audio output jack.
First look video here.