Welcome to the forums. The serial number suggests 1976 or 1986. While the presence of shifter bosses and three sets of bottle bossses point towards 1986, it's curious that it lacks a pump peg and low-rider bosses on the fork, which were fairly during this era, espeically on bicycles equipped for triple bottles. The presence of the plastic BB insert for cable routing has be leaning towards 1986 tough, given that it's a repaint, some of the fittings may be additions, so 1976 is still a possibility. I'm amazed they didn't remove the plastic insert fro the rerpaint! The most distinctive and probably OEM features are the vertical dropouts and the bridge for the rear bake cable housing stop. I concur that it's not a Miyata. Assuming 1986, it's also neither Centurion nor Lotus. The serial number format is incorrect, in addition to several frame characteristics. What brand and model are the dropouts? Have you determined the BB threading?