(!!) (#1 5687 Tungsol used 1961) 5687WA Tungsol bronze plates "O" getter halo used/very good 1961 (33.4/34.8ma)
(!!) (GOOD VALUE SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/good 1959 (29/36ma)
(!!) (SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/very good late 1950's (32.5/39ma)
(slightly microphonic) 6211 GE used/good 1956 (4.8/4.9ma) 1-2% section balance
6350 Sylvania black plates "U" getter halo used/good 1956, faded printing (8.2/8.8ma)
6350 Sylvania made for IBM black plates "U" getter halo tests like new 1959, faded printing (11.8/12.2ma)
6350 Sylvania made for IBM black plates "U" getter halo used/good 1950's, faded printing (9.2/9.7ma)
