Bottle cap (inside)
This 35-cap set included both New York teams, with 18 Yankees and 17 Mets. Mickey Mantle's by far the biggest star and will probably cost five times the next-best player. The #5 features Fred "Bubby" Talbot, who spent 4 years in pinstripes as a back-end starter. (Full career stats.)
Bottle cap (top)
The license fee from this Coke set marked a tipping point in the future of the MLB Players Association. Make sure to read both Fleer Sticker Project posts for a great collection of product scans and historical perspective.
Value: I picked up this cap for a few dollars from Philly Sports Cards. Stars and HOFers cost a few times more, with nice ones topping out at $15 to $20. (Mantle might well cost more.)
Fakes / Reprints: It'd be really hard to fake a bottle cap, unless you could somehow take a real cap and change the photo inside to another player. Suffice to say that I've never seen a counterfeit in the marketplace.