This is certainly an interesting and unique custom-ordered set, as not only weren't 18x20 bass drums offered in the Cleveland era, the Cleveland catalogs (and parts catalogs) didn't even offer 18x20 floor toms. The only 20" FT's I've personally seen were Fullertons. I'm not sure they were even available in the Dayton era as the parts catalogs don't list a 20" triple flanged hoop. Can you Rogers gurus verify this? And did anyone notice that the 20" FT has a 10-lug configuration...
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This is one bizarre set, and if it wasn't put together by Joe Thompson for L.B., it could have been just one of Thompson's experimental configurations. I remember reading in Cook's Rogers Book how Thompson was slightly chastised for spending so much production time and money putting together unique sets for L.B. So is this one of them? We'll never know.
Mike