Easy enough to date mine, being the 10th anniversary ones. Partly why I got them to mate with my 97 Bontrager. Pardon my ignorance, is the STD that bit that attaches 2 of the chainring bolts with the crankarms?
I've also seen these with the Syncros engraved on different ends of the crankarm. I've seen a photo of a snapped driveside arm that had the engraving near the spider end, as opposed to the ones we have engraved near the pedal end of the crankarm.