(!!!!) (Best Pair) EL37 Mullard branded Philips Miniwatt and Mullard test like new 1955-1957 (80ma and 81ma)
(!!!) (Recommended Single) EL37 Mullard brown base gray plate NOS 1966 excellent condition (78ma)
(!!) (Pre-1955) EL37 Mullard like new gray plate, 1 upside-down "trough shape" getter, made on or before 1955 (91ma)
(Best Value) EL37 Mullard UK black plate used/good double getters 1956 hairline crack in glass (73ma)
(Best Value) EL37 Mullard UK NOS gray plate double "O" getters 1960's hairline crack in glass created by getter halo pressed against glass (78ma)
EL37 Mullard gray plate used/good double "O" getter halos 1962 (68ma)
