How can I tell the full spec of my step motor just by looking ati it?
I have tried to figure this out on my own without looking at the drive circuit as a challenge. After finding this article, I now am fairly convinced that my motor is built after a 5-phase design.



The picture says it all really. 10 windings = 5 phases.

So since it is not a 2-phase motor, it is inherently bi-polar as opposed to uni-polar which some  2-phase designs are. Also it will typically have higher resolution than 2-phase motors. For example some motors have 500 steps per rev which gives 360/500 = 0.72° degrees per step. The resolution depends on the number of teeth.

There are many ways to drive it (see article above), and in most respects it is superior to the 2-phase design, except Torque at low speeds.