This is a 1988 Cannondale Crest Team SR500 vintage road bike frame / frameset.  Please note the condition, the derailleur hanger has been kind of fabricobbled together - I am not sure exactly what the story is because this is not my work but it looks like the original derailleur hanger may have been damaged so a new replaceable one was screwed to the frame.  It does work as intended but selling as-is because of this.  There is no other damage to the frame but there are a fair amount of paint chips, especially around the chain stays.  One of the cable guides is loose and has been zip tied to the frame.  

This frame features a Reynolds aluminum frame and a Tange steel fork.  I measure the top tube at 56.5cm and the seat tube at 57.5 cm center to center, or 62.5cm from the center of the bb to the top of the seat tube.  The headset is fairly rough and would benefit from replacement.  

Any other questions feel free to give me a shout!