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Even the less common models can't be considered "rare".
Remember that all Harmony made guitars (this means all guitars on this website) are still considered low grade instruments by most players and collectors, and can't be compared in value to the "great" names as Gibson, Fender, Martin...
Gibson’s initial answer to Martin’s D-sizes of 1931 was the Jumbo model of 1934, easily distinguished from other dreadnoughts – Gibson’s as well as Martin’s – by its body depth, which remained over 4″ deep from endpin to neck heel.
It featured a slightly larger body than a Martin; the Martins checked in (officially) at 15 5/8″ wide and just under 20″ long, while the Gibson was a full 16″ wide and 20″ long.
The J-45 is Gibson’s basic mahogany-body dreadnought, the Gibson equivalent to Martin’s D-18.