Welcome to the forums. The Nishiki Regal was a mid-1980s, entry level model designed for the Canadian market by Norco. Your serial number is from 1983 but the Regal is not listed in that year's Canadian market catalogue, so it may be a 1984 model. The samples that have turned up generally feature Tange #5 tubesets, 27' wheels, Suntour AR derailleurs, Sugino Aero #5 cranks and Dia-Compe self-centring brakes. They are very similar to the 1983 Olympic and it may have been the Olympic's successor in the Canadian market, situated just above the bottom of the line Rally. An overall driveside picture, detail pictures of the major components (crankset, rear derailleur, brake calipers) and a picture of the tubing decal would be appreciated.