AC seatposts weren't anything special, in terms of aesthetics. They are very plain, without any flutes or any other details on them like found on other sestpost. What I think they were really known for is their strength, while at the same time, being quite lightweight.
__________________
72 Line Seeker
83 Davidson Signature
84 Peugeot PSV
84 Peugeot PY10FC
84 Gitane Tour de France.
85 Vitus Plus Carbone 7
86 ALAN Record Carbonio
86 Medici Aerodynamic (Project)
88 Pinarello Montello
89 Bottecchia Professional Chorus SL
95 Trek 5500 OCLV (Project)