Hi, everyone.......first post.....I recently bought what looked like a WFL tom with larger zephyr lugs. Upon examination, I discovered the grain of the interior ply to have vertical grain, like a typical MIJ. the only alterations to the shell seem to be where someone changed the tone control, and put 3 Slingerland floor tom brackets on it. Does anyone have any insight on this? It has no bevel on edges, just flat and rounded slightly on outside edge, which, to me, says it was from the era of calfskin.