American Eagle transitioned to Nishiki in late 1971, for the 1972 model year. Most models retained the old names for the 1st model year after the transition. The subject bicycle does indeed appear to be an American Eagle Semi-Pro, which eventually became the Nishiki Competition. Given the era, I'd consider it a nice, upper mid-range model. It's hard to tell how much is OEM based on the non-drive side photo. If it is OEM or near OEM and cleans up well, there is some money. However, it does appear to have the OEM Sugino Mighty crankset, so we may be able to determine the year from the date codes stamped on the back of the arms (format 4x-x), The serial number would also be appreciated.