(!!!!) (Best Pair) JAN-CEA-5993 Bendix NOS 1955 slightly faded printing (52-54/40 and 53-54/40) (rare)

1 pair) JAN-CEA-5993 Bendix NOS 1955 boxed in 1957 slightly faded printing (dried ink)

1 tube) 52/40 and 54/40

1 tube) 53/40 and 54/40

(5993=Premium 6X4 with a different pin-out, excellent construction, long-life tube)