4 old enamel on metal pins. The Sonic 3 one is rumored to be a pre-order bonus item for the Sonic 3 game on the Genisis. The "Sega is #1" is the oldest of the set. The American Flag holding Sonic is uncommon.
At the right is a mixed-up pin collection. This contains pins from different sets and times. The Sonic3 pin, you can recognize from the special Sonic 3 Japanese pin pack. The eggman with his spike-ball is a varient on a design which appears on a Japanese patch. The Knuckles design has the un-attractive vertical eyes stock art common to European items.
You can see this enamel pin above, but this shot will get you the detail. It's surprising really what they could fit onto the tiny pin. It's exactly like the USA box art complete with tiny egg-o-matic in the way background. This is a great pin to collect with some really superior detail.
A close-up of the above Sonic 2 pin.