[Boatanchors] CDE CDR rotators

[Paul Kraemer]

Can someone please explain the differences between HAM II, HAM III, HAM M and other rotators by CDR / CDE.
I have a HAM (no suffix indicated on label) I’m trying to check out and not finding any manual for that one.
It is a simple square box control with large direction meter that covers most of the enclosure front.  Both the box and the rotator have two four lug terminal strips arranged one above the other and no numbers on any terminals
Thanks for any help
Paul K0UYA