I was sceptical that this was actually going to be a decent soundboard (especially a good one) as a lot of "bad Traffic" (sorry) has circulated on boot.  Surprise, surprise though.  It's an excellent stereo soundboard or possible (BBC) broadcast.  I can't find print evidence of this show being at the Anderson Theater but it does seem they may have been at the Fillmore East at this time and apparently the BBC did record and broadcast a show from there.   Non-exciting (typical Mainstream) artwork but I can imagine photos of this era are not easy to come by.  Probably the best boot of the band during this time.