Wow, a Metal Sonic pin!
The 25th Anniversary celebration really is being inclusive of lots of fan favorite characters with this one. This pin features the winged ring with stars along it, but instead of Sonic in the middle, there's Metal Sonic facing partially away. The background inside the ring is blue/pale blue 'sunburst' type rays as all the other pins have. The 'title ribbon' has the 25th logo & the name "Metal Sonic" spelled out below it. Everything here is goldtone metal & colored enamel. The art is really good, it's a neoclassic piece to keep things interesting. The pin is in the Sega Shop in 2019, and should be about 15 dollars. (It's high for a not-too-big pin...but it IS Metal Sonic by himself on merchandise....)