Gibson have a Japanese subsidiary, under the name of "Orville".  Their models are very high end versions of USA Gibsons, and only for sale in Japan.  Fender also has a Japanese arm, and the quality of Fender Japan (as opposed to Squier) is amazing.

There are also several other companies based in Japan who make unbelievably accurate replicas, which don't get seen in the US, because of trade embargoes and the possibility of trademark infringement.  They do, however, have a large customer base in Japan and the Pacific Rim.  Here in the UK, we also get a fair number of superb Japanese guitars.  And, to be fair, some bloody awful ones, too.

That said, Mask-da may be a wealthy guy for all we know.  I believe Batlab is reasonably well off, so it's possible Mask is able to just buy his reference material.  OTOH, he may have a lot of musician friends and associates who loan stuff to him.  In any event, there's no denying the quality of his work, or generosity. 

Coppula eam se non posit acceptera jocularum.

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