Two working Eico power supplies or battery eliminators. These are designed to be used on the workbench as 6 or 12 volt supplies for repairing automobile radios. They use a unique variable transformer like a low voltage variac or Lionel transformer. Variable voltage, but not a regulated supply. On the 12v setting (10amp) output is adjustable from about 1 volt to 31 volts. On the 6v setting (20amp) output is adjustable from about 1 volt to 15.8 volts. The unit with the white posts has slightly lower output (Hi is up to 28v and Lo is up to 14.3v).
Schematic is here; http://www.nostalgickitscentral.com/eico/schematics/eico_schematic_1064s.pdf