1999 Pinheads MLB Collecter Pins
I dislike this product's name since it implies stupidity, but it does rank among the more difficult Frank items. Not rare by any means, as I've seen it come to market several times since its release, but certainly difficult if you don't know to search for it.
Collector's Note: Also issued as a keychain.
2006 Aminco Bobbing Head Pin
Really amazing and fun pin from AminCo - a leader in the production of high quality pins/pinbacks. Incredibly this bobbing head pin actually works! Note the MLB Hologram.
1995 Pinnacle Pin Redemption
Surprisingly easy on the wallet considering that it was only available for a short period in 1995 from randomly inserted redemption cards which had to be mailed in for the actual pin - plus - winning redemption cards weren't returned. The cards themselves are considered tough in that they're full-bleed and prone to chip damage on the edges & corners - very tuff to find in true mint condition.
1996 Big Hurt Club Lapel Pin
One of the more difficult items to collect from The Big Hurt Club.