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84=6Z4 GE NOS 1950 (51/40 and 52/40)
84=6Z4 Philco used/fair 1940's (42/40 and 43/40)
84=6Z4 Raytheon used/good 1940's (52/40 and 54/40)
84=6Z4 RCA NOS GT-shape glass slightly tilted glass 1967 (44/40 and 47/40)
84=6Z4 RCA NOS GT-shape glass tilted glass 1967 (47/40 and 48/40)
84=6Z4 Sylvania branded RCA used/good 1940's (49/40 and 49/40)
84=6Z4 Sylvania used/good 1940's (49/40 and 51/40)
