Saw this on another board, anyone have any ideas?  
 
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250685243520

No ideas...but it does make me smile : )

Mr. Doug Irwin did some work for me back in the 1970's  
I am not sure if this is one of his.  
 
 But this one is ! http://cgi.ebay.com/Custom-Doug-Irwin-Guitar-Jerry-Garcia-Grateful-Dead-/320579886403?pt=Guitar

Tom Lieber could give you a better answer for authentication  .

That's a wild Irwin guitar Wolf,
...and sliding pickups to boot!

Yes . it is an interesting one. I know someone that has one of his Basses that also has sliding pick ups.

Then there is Jerry's Travis Bean on ebay..
 
http://cgi.ebay.com/1976-Travis-Bean-Guitar-Jerry-Garcia-Grateful-Dead-/150481586509?pt=Guitar

Check out the questions that are asked at the bottom of the auction page  ! ( Jerry'sTravis Bean ebay Auction )

I saw that. What a crackup!

Wow, Hal must see that!