Patiently scrub some paint off of the top tube. If it's model paint you can get it to come away from the original finish easily enough. The reason it's painted is because a sweater rode it and the top tube has some rust, probably. If you can get that crap off, and the rust isn't awful, then you can find a closer match and just paint the top tube. It looks like the rest of the finish isn't too bad...I guess we need better pictures to help any more...