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The whole appears to be factory. On either side of the whole is a hole for a screw or some attachment. I've seen other hardtop gtx's with it, so I don't think it is from a convertible.
As stated in a previous post - the dash is either out of a convertible or a station wagon. the top or back window switch goes there. Look in the 67 Plymouth operators manual in the glove box!!!
Tailgate window and convertible top appear to be the only options.
That and the fact that there are two additional holes on either side suggests someone drilled it and mounted an aftermarket switch there for something.