Just what is that mystery guitar?

guitarz.blogspot.com:
Casey writes:

Obviously this is a very young Chet Atkins, with a nice Gretsch, but what the heck is the dude holding in the background?

My guess would be that it is something built by Paul Bigsby - I recognize the style. However, that's a weird body shape even by Bigsby's standards. It looks almost like a doubleneck with the lower neck removed.

Can anyone out there reading make a better identification?

G L Wilson

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