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(!!!) (Single 1966) 6688=E180F Siemens Holland NOS gold pins 1966 (8ma)
6688 GE 5 Star used/good (7.2ma)
6688 GE NOS 1966 (9ma)
6688=E180F Philips Miniwatt Holland SQ gold pins used/good 1966 (8.8ma)
6688=E180F National UK black plate NOS probably made by Amperex (9ma)
6688=E180F National UK gray plate NOS probably made by Amperex (16ma)
(!!!) (Single) 6688=E180F Amperex PQ USA NOS "O" getter 1968 (9ma)
(!!) (Best Single) E180F=6688 Philips Miniwatt SQ Holland gold pins "D" getter NOS 1957 (14.2ma)
