New Footage of Buenos Aires Show??

I don't know if this footage has already been seen by many here, but the first 5 minutes or so on this video shows the building of the stage forthe Buenos Aires show in Feb 28, 1981.

[url=http://www.youtube.com/watch?v=4PlPOQHVci8]http://www.youtube.com/watch?v=4PlPOQHVci8[/url]

It is very old, it was also shared here on many many DVDs