6BL7GT Sylvania low hours 1953 D = rectangle getter halo long scratch on base (33.5/37.5ma)
6BL7GTA GE gray plates NOS 1974 (47/53ma)
6BL7GTA Sylvania used/good 1960's (31/33ma)
6X4 GE like new 1950's "D" getter (54/40 and 54/40)
6X4W GE used/tests like new 1960 era "D" getter (52/40 and 52/40)
UY41=31A3 Amperex Bugle Boy France NOS 1964 (0 in stock)
UY41=31A3 Philips Miniwatt "D" getter halo NOS 1958 (1 in stock)