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(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1981 (7.5/7.8ma)
(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1982 (6.0/8.8ma)
12E1 AEI by STC England black plate NOS (120ma)
56 GE used/good 1940's (4.2ma)
56 Made in Holland NOS 1940's (5.1ma)
56 National Union engraved base used/tests like new 1930's (6.0ma)
56 National Union used/good 1940's (5.3ma)
56 National Union used/good 1940's (5.9ma)
56 National Union used/good 1950 small faded getter (4.1ma)
56 no name NOS 1950's (5.7ma)
56 Philco by Sylvania used/good 1940's (5.2ma)
56 RCA Balloon engraved base black plate tests like new 1930's (4.7ma)
56 RCA no name NOS 1940's getter halo screen loose at bottom of tube (6.5ma)
56 RCA no name NOS 1940's made for Radiotelefonica Argentia (5.1ma)
56 RCA used/good 1940's (4.7ma)
56 RCA used/good 1940's plate slightly tilted (4.9ma)
56 Super Airline used/good 1940's (4.1ma)
56 Tungsol rebranded Raytheon tests like new 1940's (6.1ma)
56 Ultron UK used/good 1952 (4.5ma)
6973 RCA black plate used/good 1950's (34ma)
