I as well as others think the Corona made Guilds are highly under rated guitars. The build details on the acoustic models are pretty much the same as the late Westerly made models. My Corona Acoustics are a little heavier in the build category but they both sound Awesome. If you like it and it looks to be in good shape structurally I say go for it. Just make sure the string height at the 12th fret is acceptable and there is room to lower the saddle so you don't wind up buying a guitar with a bad neck angle.
TX