T-Mar, I have another Canadian MTB to add to the database. Nishiki Carrera womens MTB serial number: CF03 218. Therefore 1986. "Designed by NORCO" Some of the component are 1986 and some are 1987. Many or the components are the same as on the 1987 Colorodo, as listed in the 1987 catalogue. I know there ia a Carrera road bike in the 1983 catalogue, but this is a womens mountain bike frame. There are no lugs at the head tube. All of the images of early Nishiki mountain bikes show them as welded, not lugged. The two 1980s Nishiki MTB frames that I have are mostly welded. The chain stays at the bottom bracket are lugged.