It could be argued that '70's Gibsons, at least more often than not, don't sound like Gibsons at all. In my experience, this statement fits many of the more recent ones I've played also.
Another F-5, not by Gibson, in your price range: a used F-5 by Audie Ratliff at Carter Vintage. Also Cross mandolins, available at Gruhn's and at Carter's. Both brands are made in Tennessee.
If you feel you must have a Gibson F-5, it won't be easy to find one in serviceable condition in your price range.
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