Although I don't have a scan my favourite would be my 97/98 Finest Gold Embossed Refractor. Definitely not my rarest card but it took me 5 years to find it!
Hmm changes all the time but I guess this is one of my favs. Historic and damn rare. Larry Birds first ever basketball card. A limited edition Terre Haute first national bank/ Indiana state police card. This is a real nice example of one too. Won't part with this ever.
This like my courtside auto has featured in Beckett mag before when they needed a scan of one. A slighty oversized card.
Its listed at 1983 but there has been contention that date was wrong.
You could almost say this Bird is his first card but I wouldn't count schedules even though its a card not a fold out like most. Its for the 78-79 college season. Mines not in great condition though :-(