Yup, it's an MS1 (or possibly an MS2). I checked against some pics I have of an MS1 I did years ago,
and the features are a match.
1) Crooked turn signals.
2) Curved corners of the "upper" cheeks. (The MS3 was resculpted to have squared off corners.)
3) The upswept angle of that little extension behind the ear platforms.
My pics are from 2007 and they're pretty lo-res, so posting them wouldn't do a whole lot of good, I'm afraid.
But it sure looks like you have yourself a Marrow Sun v.1.