First generation Campagnolo seat post.
In chromed steel. (Photos courtesy Dave Ross)

Gran Sport post
became all aluminum
construction

First generation Super Record, 2 bolt style with factory fluted shaft.
(This particular seat post has had it's threaded pivot cylinders replaced with Arnold Industries alloy pieces)
      

Later version of Super Record with single bolt
(Notice location and style of embossing)
        

Yet later version of Super Record Single bolt post.
(Note location of embossing)