I never knew one guitar from another, nor the history of Jerry Garcia either. However I must ask what brand guitar did Jerry use here in this video?
https://www.youtube.com/watch?v=EvPe4CEkSbE
Ahhh. The famous Doug Irwin Wolf. Jerry played it almost exclusively from late 73-76, including in this video from Winterland in San Francisco on 10/17/74 (the 2nd night of a 5 show run that preceded the Dead's hiatus until June of 76). Here's the story behind it:
https://extrachill.com/2020/12/jerry-garcia-wolf-guitar.html