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I've seen those Wilkinson carbines at gunshows and, I think, one dealer. Never fired one and know very little about it except they were never common. I think at one time or another it was known as the 'Linda.'
I have a pistol that was made by Wilkinson for another company.,a sort of .22lr clone of a Browning Baby in .22lr or a real small AMT backup sort of in design actually, the Auto 9.
Wilkinson pistols like this are called the Sherry in .22lr IIRC and the Diane in .25acp. He was named Raymond, he should have made the Ray gun! I knew a dude that met him.