The serial number indicates that it was manufactured in April 1980 and is therefore a 1980 model. The stamped dropouts, in conjunction with chromed fork ends suggest a UO9 or UO10, while the colour is indicative of the latter. It has had several components replaced, including a least the brakeset, pedals, saddle, and bar wrap.
My decision on the bicycle's future would be highly dependent on the mechanical condition but rather than investing I'd probably part it out. There's decent money in the brakeset but it's unfortunate that the hoods are missing. There should also be some interest in the aluminum Simplex shift levers by owners who want to replace their Delrin units with something having a much more positive feel. The pedals look decent too but given the missing dust cap the condition may be poor. It's hard to comment on the derailleurs and crankset, without a photo of the drivetrain.