it is not just an OE version of the PRO. it is a separate bar, different from the PRO level. it is an Ergonova OE. I believe they are usually heavier, although as you weighed yours, i could be wrong.
some of the Ergonova OE bars had the "egg" shape of the bar tops put in the wrong orientation. they sometimes slope down to the front, instead of being flat or with a slight downslope back.
they come on some Cervelos. notice the other 3t parts are actual PRO or TEAM level parts.http://cervelo.com/en_us/bikes/2011/R3/prices-specs/