what kind of guitar did he used....it had three humbuckers....wierd sorta shape....greyish color...who makes it....only one ive ever seen
Jerry had a lot of guitars. The customs were Irwins with one Alembic (the first custom, I think). A complete history is here.
Here is a great interview with Doug Irwin and his relationship with Jerry...http://dozin.com/dougirwin/interview.html
He had them custom made. But when he died, they went back to the maker I think. That's what my Dad said and he's the Greatful Dead encyclopedia.
There was some controversy for a while over who they should go to. If I remember right, Bobby wanted to put the guitars, along with other memoribilia in a SF museum called "terrapin station". He claimed the guitars were owned by the GD and not by Doug Irwin. The case went to court. Irwin got the guitars back.