Common Mode Inductor Inductance?
Since it's a common mode inductor, it's intended to be used for a signal pair.  For signals that are common to both conductors in the pair, it presents 1mH of inductance.  Since the windings are counter-wound, for signals that are differential in nature (source on one conductor, return on the other) it presents (ideally) zero inductance.  So if you wire it such that both windings are in series in the correct direction, you can use it as a 1mH inductor.  

However, common mode chokes are typically designed to be lossy, so that the noise that they are filtering is dissipated as heat from hysteresis losses.  Therefore it might not make a good single-ended inductor for your purposes.  

Why not just get or wind a 1mH inductor that meets your requirements?