When did Gretsch switch the diamond plate script? Notice the pic on the left has it along the edge, the right pic has it centered nearer to the hole.Also, are the screw threads different for the 50's bass drum lugs than the tom lugs?...Or did somebody sell me BD lugs from the wrong era?Last question, on 50's 18" 3-ply bass drums, is it unusual to have the Pratt muffler on both batter and resonant as mine is? and if it happens, were the control knobs on alternate "panels" or were they aligned like the toms?Thank you ahead of time for your help.