(!!!!) (Best Pair) 80=U50 Marconi Madrid Spain tall bottle NOS 1949 (54-64/40 and 57-62/40)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (33.2ma and 34.2ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (35.2ma and 34.0ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (37.5ma and 39ma)