26 National Union engraved base tests like new 1930's (6.0ma)
6C5 Wards Airline by GE used/tests like new 1946 (9.0ma)
6L6GA National Union used/good/80% 1940's (56.4ma)
6L6GA Sylvania SESCO used/good 1950 in white box (56.5ma)
