The original Unica-Nitor saddle appeared inthe early sixties with its special seat post.The plastic saddle was on a two girder frame which went onto a sort of shark fin on top of the post . This fin had a slot and aloose plug with an eccentric hole through it . The girders of the saddle are slotted to agree with the stuff in the shark fin .Add two bolts to hold it all together . Plain plastic saddle has molded in side labels:Unica on one side,Nitor on the other. Next version is plain plastic with wire rails to match a Campi narrow seat post . Molded in Unica/Nitor labels.Rumors of occasional red plastic besides black. Seth Finkelstein at Santa Cruz CA