I would have to say that it looks like an authentic VOPO (Russian Capture) HSc. If you care to compare it with the one on Mark Castel's excellent site I think you will see enough similarities to verify it yourself:
http://www.p38guns.com/814389.htmBy the way, the Grip panels are also authentic Post-War manufacture. The air bubbles are a dead giveaway since the same molds were used as Wartime production but they did not quite have the material formula right.
We have recorded a few other former Army (Eagle 135) HSc's around the same serial number as yours that were Russian Capture, including the one on Mark's website.