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(!!!!) (Best Pair 1955) CV378=GZ37 Mullard UK "D" getter NOS 1955 no printing (56-56/40 and 57-57/40)
(!!!!) (Best Value Single) GZ37 Mullard UK NOS 1966-1967 slightly tilted glass (51/40 and 52/40)
(!!!) (Single) CV378=GZ37 Mullard low hours/tests like new "O" getter halo 1967 some stains around top of glass (51/40 and 51/40)
