Information has been confirmed and images obtained.
Stay tuned for a new entry. For now I will leave this old entry here.
Another one of Kurt's guitars sold at an auction in December 2008.
It was a modified 70's Fender Mustang with a Univox humbucker.
This is the second Cobain guitar selling for 6 figures.
The first was a Mosrite Gospel in 2006 (here).
The guitar was sold by Sluggo of The Grannies and Hullabaloo.
Update; It was the SG
It was displayed (on loan from Sluggo) at the Experience Music Project (Seattle, WA) until he decided to sell it in 2008. The news articles mention that it was smashed in New Jersey.
This may lead one to assume it may be have been the sunburst Univox. However two of the articles (NYTimes and Rolling Stone) mention a "Mustang"; hence the confusion.
My guess is that Kurt had smashed both the Mustang (possibly in 7/9/89 PA) and his sunburst Univox (7/13/89 NJ). Looking at photos from nirvanaguide.com, Kurt did not play guitar on the show following the Maxwell's gig. He played the whole show with no guitar. The show after that, he is seen with a white Univox.
7/9/89 - Kurt is playing a sunburst Mustang (top photo)
7/12/89 - Kurt is playing a natural/sunburst/duct taped Univox
7/13/89 - Kurt is seen smashing the Univox (see photo)
7/15/89 - Kurt did not play guitar (see photo)
7/18/89 - Kurt is playing a white Univox
If anyone has photographs from when it was displayed in Seattle, or at the auction please share!
Thank you - Jon