i checked the serial numbers on schwinn on http://www.bunchobikes.com/serialnumber.htm but now i'm not sure if its even a schwinn.. on the bottom bracket it reads: MOD.50246742 and then beneath that in bigger numbers it reads: 2 53972 it also looks like the headtube used to have to rivets that held on a badge.. well heres a pic of it.. what is it?