Epiphone Masterbilt AJ-45ME Ebony First produced by Gibson in 1936, the Advanced Jumbo acoustic guitar was quickly replaced by the J-200 Super Jumbo after only 300 instruments were produced. Favored by bluegrass players in the 1930s, Advanced Jumbo guitars were highly regarded. Some modern collectors have dubbed these guitars "the best flat-top in Gibson's entire history." Currently prized by collectors and musicians, original Advanced Jumbo guitars sell for exorbitant sums of money on the used market. Now, thanks to Epiphone, you can grab one of these revered instruments for yourself.