Knowing something of their frames, given that it's 631, it could be the Smoothie ES (for caliper brakes) or the Double Cross for cantis? I'm very interested in them as I am a cheapskate and love nice framesets. Personally I don't know of any steel handlebars that are still made, but there's no reason that a thin walled, butted steel handlebar can't be a serious contender. Though I also think that the "shock absorbing" qualities of steel vs. other frame materials are oversold, I do think the idea of a steel handlebar utilizing some contemporary technology is a very interesting idea, tell us if you find one.