Thxs for the S/N. It was manufactured by Fairly of Taiwan, in November of a year ending in 3. That would make it either a 1984 or 1994 model. Some of the components look 84-ish but that is quite early for a uni-crown fork. For instance, the Norco Mountaineer didn't get this fork until 1987. However, Norco discontinued the Sekai brand in 1990, so it shouldn't be a 1994 model. Despite the fact that the 3 is a relatively sharp impression, I'm wondering if it might not be an partial 8, which would make it a 1989 model. It does look very similar to the Canadian market 1989 Nishiki Carbiou, which was also designed by Norco.