In the 1990s George Washington Machinery had a 1000ee, I believe it was made in 1964. There were some differences from the model 70.
It had a longer electrical cabinet with 6 big vacuum tubes for the spindle control.
The carriage was a little different, the compound rest was sleeker in shape.. almost delicate looking.
The hydraulic tailstock was larger, with a pressure gage. With the pressure gage and accumulator the tail center pressure can be set on the gage, the pressure will be maintained on the work as heat expands it. The tail stock quill travel is worked with the little star wheel.
The electrical cable to the 1000ee carriage is the type that self coils, easy way to spot the 1000ee.
The 13ee must fit in somewhere.