I have have been looking this up but not sure what I have. The serial num is on the left rear dropout. This was reprinted black, originally red after removing the cranks and cups. This was a rebuild as well. It had newer mtb steel rims, a 2 speed sprocket up front and a 5 speed cassette on the rear but only a single chain with no derailers... A messenger seat no to bad... Just a bit puzzled what I have... The ser# R335282. To many for schwinn, Columbia ??? And still going thru all the other manufactures the used the dropout location. The grips are dyno on a hybrid city the bar. I figure this would be a fun rat project. I may need a tank though. Thanks in advance