Here's an eBay auction for a Gretsch 640 semi-solid acoustic form 1997. From the photos you can see it's authentic. Now this is one model I think should be re-intoroduced as it will sell well against it's only competitor - the Crafter SA series:

http://www.ebay.com/itm/Rare-1997-Gretsch-Synchromatic-G460-Acoustic-Electric-/200643315339?pt=Guitar&hash=item2eb746068b

I saw that. It's intriguing.

wonderful flame top.