6SD7GT Continental by National Union NOS 1950 era (11.6ma)
6SD7GT Ken Rad NOS 1940's (11ma)
6SD7GT Ken Rad NOS 1940's (12.6ma)
6SD7GT Raytheon NOS 1940's (11ma)
6SD7GT Raytheon NOS 1951 (11ma)
6SD7GT Raytheon NOS 1956 (9.6ma)
6SD7GT Sylvania NOS 1940's (11ma)
