Another clip from the 1988 Bulgarians Training Hall DVD.
Stefan Botev (110kg lifter at the time) with what looks like 5 reds? + collars on each side.
That would make it a 275kg Clean.
Post your weight guesses in the comments.
Update: Matt in the comments said:
He [Abadjiev] said he never let Botev do more than 260 (which he did for a double very easily) in training and that it took several lifters to restrain him from loading the bar to 270 which he wanted to do. It is not 275.
Update: Regarding the weight, check out this article, which confims what Matt said.