I don't know what the original equpment would be, but I don't think you will have to hunt down too much. The seatpost looks too modern? Brooks saddle of course. That's about it. Plus what Kurt said!
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"