The OConnor's 2575D is from their Ultimate range of fluid heads and features stepless, ultra-smooth pan & tilt fluid drag specifically designed to give you the perfect control and stability for high end productions.

The 2575D has become the standard for  film cameras as well as corporate and commercial work. Featuring OConnor's patented sinusoidal counterbalance system for true, accurate balance at any point in the tilt range as well as OConnor's stepless, ultra-smooth pan & tilt fluid drag.

Features...
The new platform has all the controls on the camera operator’s side of the head. (i.e. left side).
The platform release lever has a one touch finger actuated safety release catch.
This allows for one “finger” or hand action to undo the safety catch and open the lever.
Dual platform scales.The platform now has 4 handle rosettes.

Watch video here https://www.youtube.com/watch?v=5YzlX0bPOf4