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also there is a hole punched through the bottom of the guitar that seems to have been an amp jack. looking at other silvatones they do not have the hole. I question weather this is brashers guitar as it said in the article that he fitted his guitar with an electric plug to use on his amp or something to that sense.
I just thoroughly looked over the cover plate, and the body, inside and out, including the neck stick. There are no markings of any kind. I recall that the original copper or brass resonator (I no longer have it) had the patent number stamped into the rim, and I think that Brasher's initials were beside the patent number. Or, perhaps those markings were on the biscuit? It's been too long!