Around '75-76. Small flange hubs were the trend. I remember ordering a pair of Campy small flange hubs from an ad in Bicycling or Bike World. $45 a pair. Retail back then was about $80. Took about 6 weeks for delivery.

About the same time the Hi-lo flange rear hub was popular too. That was popularized by frame builder Hugo Rickert at the '72 Olympics.