What you have there is a bipolar high-performance stepper designed for high torque and high speed. They are meant to be driven from a high voltage via a chopper IC that keeps the average winding current constant (like PWM for motors but controlled directly from current). With a high voltage supply the chopping acts as a buck-regulator (which is power-efficient) but allows lots of back-EMF and thus high rotation speed.
A typical driver chip would be the A4988 or L6208 or many others
You'll notice the motor has low winding inductance as well as low resistance - this allows high PWM rates (above the step rate).