It's unfortunate that Guild got moved around so much, but if it isn't a "factory 2nd" it should be a good guitar regardless of where it was made.
They generated a fair number of factory 2nds both from Corona and Tacoma, generally having a "2" stamped into the headstock under the serial number, and/or noted on the inside label, or no serial # at all. There are 2 of these 2nd's at a store in my town right now, and they are priced accordingly - one is a D-40, the other an F-412, both from Tacoma. Great guitars, very minor cosmetic flaws.
A JF-30 is a beautiful thing. Being a 12er, I would be more concerned about the shape its in and the ease of playability. Watch for the bridge lifting or the top bellying up below the bridge. I concur that one in good shape would be a good buy for something under $1K, and a factory 2nd would be maybe $600.
Good luck!