As it's your hobby shop, can you measure these four wires? Unipolar motors have all four wires connected, on bipolar motors one wire has a connection to only one other wire, the other two wires are isolated.
@xiando: it's just a forum here. No need to get red in the face. :) You're not obliged to answer a question and if the questioner isn't satisfied with the answer you give anyways, it's his problem, not yours. :)
@xiando: it's just a forum here. No need to get red in the face. :) You're not obliged to answer a question and if the questioner isn't satisfied with the answer you give anyways, it's his problem, not yours. :)