They have been "drilliumed" at some point. They are the second pair of hubs I have owned like that. They, and the other campy parts on the bianchi, came off a '73 paramount track bike I bought that was too big for me, and somewhat rusted. I like to believe the story that they are "repurposed" tandom hubs, drilled out back in the day at the Scwhinn factory. The offset (non-spoke) holes are slightly larger than the current spoke holes, intended for thicker tandom wheel spokes, supposedly. That would mean my hubs were for a fixed tandom paramount originally! My other set are standard high flange record road hubs, '72, and only the rear was drilliumed.