Hi again,
I made a little "B&O-1960's-research" at the weekend and maybe the seller didn't make mistake with the name of his RG ("Beomaster 611RG").
If you look here:
/forum/beogram/can-anyone-identify-this#post-2221822
you can see that we already had short discussion about very similar (I would say same) model here.
First presumption was that the turntable in this specimen was not the original one and it was built in latter. But now we have the second one with the same "configuration" of the turntable on the left side. Maybe there was a version called Beomaster 611RG between Grand Prix 611RG and Beomaster 900RG. It must be made in limited series and would be very rare one.
Unfortunately the guy who started the thread I am posting here didn't answer and we haven't got the information from him.
Maybe your seller could provide you a picture from the back side with the label (if it is still present)...
In this case you could acquire very rare version of RG. Technically there are no important differences between the early version of the Beomaster 900 (to bee seen on your pictures, with grey front) and the latter one with the black front. I think only the transistor types were updated and eventually the stereo decoder is not present (it was an extra option). The 42VF (or the Beogram 609/610 version) are very stable and good sounding TT's if serviced and the BG1000 must not have bee the big step.
The rest is a optics. You have to know which model you prefer and try to find really good one.
Waiting for the news about this rare beast ...👍