8-13-75....One From the Vault.
There's a great clip on Youtube, photo montage over the audio.
For some reason couldn't get the link to copy, but put Gratefuld Dead 8-13-75 into the search box & it's right there.
I immediately thought of this version too. The 8-13-75 show is almost perfect.
I used to have a tape of a show from I think Indianapolis 76 where they did an interesting spacey jam in the middle of the H-S-F's.