(!) (SINGLE) 7F7=VT-189 Sylvania rebranded GE round black plates used/strong 1940's (2.2/2.3ma)
7F7 Sylvania chrome top round black plates like new 1956 no printing (2.5/2.4ma)
7F7 Sylvania rebranded GE round gray plates NOS 1952 (2.0/2.4ma)
7F7 Sylvania rebranded RCA Victor parallel round gray plates used/good 1950 (2.1/2.4ma)
