"Weight weenieism" was definitely not in Campagnolo's design agenda back in the mid to late 80's. My Delta calipers are about twice the weight of my Spidel sidepulls! A lot of their then new slant parallelogram RDs had big solid chunks of aluminum at the pivots that also weighed them down.
Campy rims were also typically heavier than a lot of other rims in the market.