I bought this 4x12 unloaded cabinet last night for $299. It was listed as a “1973 1960” model cab. But looking at it, and it appears it may be a bass cabinet. There are screws for corner protectors. Two questions: -Is this a 1960B or 1982 model? -Are the dimensions of the 1982s different than the 1960s? It comes with its original casters.