Probably a killer spiderman but still looks like it might be a submarine. The thing about submarine is that its not just a blue base, its a blue+clear base. Usually a lot whispier than this looks but dunno. Is there obvious clear glass on top of the blue? Even as just a spiderman its top of the line, maybe go for more like $60. Looks like it's in great shape.
Btw Kevin, superboy is a little different, needs to have a hint of yellow. The name was coined to cover superman wanna-bes long after the spiderman nic.
1.25 inches, wow thats huge! Lots of shelf appeal in that bright eye looking back at you. Not sure of value but $50 seems a little low.