You can make and educated guess. It is not hard to figure out winding configuration and their resistance using a multimeter. It has 4 wires, so it is a bi-phase motor, it will have two windings.
You can also estimate the winding current based on the motor size and by the temperature when you actually drive it.
But it would be easier to ask manufacturer. The problem with stepper motors is that they are often made for a specific order, and if third-party companies sell surplus, original manufacturer won't disclose details.