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(!!!!) (Best Sound for the money) 6550 Tungsol branded RCA NOS and used/like new vented gray plate 1965 and 1974 (130ma and 134.5ma) (close Gm)
(!!!!) (Single) 6550 Tungsol branded Sylvania smooth gray plate used/goo 1960 era (116ma)
(!) 6550 Tungsol smooth gray plate used/75% 1963 (105ma)
