4 0 s ▁as ▁fact ories ▁shift ed ▁to ▁support ▁the ▁war . ▁As ▁parts ▁became ▁scar ce , ▁non - standard ▁versions ▁came ▁out , ▁made ▁from ▁a ▁variety ▁of ▁le f to ver ▁parts , ▁called ▁floor ▁swe ep ▁models . ▁ ▁Term in ology ▁ ▁Although ▁this ▁term ▁normally ▁refers ▁to ▁World ▁War ▁II , ▁when ▁used ▁to ▁describe ▁Gib son ▁ban jos , ▁the ▁term ▁pre war ▁operation ally ▁refers ▁to ▁ban jos ▁made ▁prior ▁to ▁ 1 9 4 7 . ▁ ▁Production ▁of ▁metal ▁ban jo ▁parts ▁was ▁susp ended ▁during ▁World ▁War ▁II . ▁ ▁However , ▁small ▁numbers ▁of ▁Gib son ▁ban jos ▁continued ▁to ▁be ▁constructed ▁and ▁sh ipped ▁during ▁the ▁war ▁years ▁using ▁stock s ▁of ▁metal ▁parts ▁remaining ▁in ▁factory ▁b ins . ▁For ▁that ▁reason , ▁Gib son ▁ban jos ▁produced ▁between ▁ 1 9 4 0 ▁and ▁ 1 9 4 5 ▁often ▁reflect ▁the ▁cre ativity ▁of ▁shop ▁personnel ▁rather ▁than ▁standard ▁catalog ue ▁descri ptions . ▁Production ▁of ▁metal ▁ban jo ▁parts ▁res umed ▁in ▁the ▁Fall ▁of ▁ 1 9 4 6 ; ▁however , ▁it ▁is ▁commonly ▁believed ▁that ▁the ▁metal ▁composition ▁of ▁found ry ▁products ▁delivered ▁to ▁Gib son ▁after ▁World ▁War ▁II ▁was ▁inferior ▁to ▁that ▁of ▁parts ▁produced ▁prior ▁to ▁ 1 9 4 0 . ▁ ▁On ▁April ▁ 1 2 , ▁ 1 9 4 7 , ▁the ▁Gib son ▁Inst rument ▁Company ▁changed ▁their ▁corpor ate ▁logo ▁from ▁script ▁letter