Yup a combination X/Y and rotary table.
Those handes look distinctive, but I don't know who made them.
As others have pointed out someone spent some time building some add-ons for a particular job; the little fixture table, the pawl and the brake.
-brino
EDIT: looking and thinking more, a new unit should have three crank handles; one for X, one for Y, and one for rotation.....
I wonder if the disk with detents, the pawl and the brake were to replace a broken/worn worm gear drive.