Originally Posted by
klowdnine
Nishiki Riviera SN- K10 864.... is it an 1986 model Us version?
Welcome klowdnine,
the serial number that you quote is not quite right. Is it possibly KD10 864?
The format for the serial number appears to be for a 1985 model year Riviera. The 'K' indicates the USA market. If there were a 'D' in the serial number then the frame was manufactured in 1984.
1985 is the first year for the Riviera model and the only year when serial numbers for that model started with 'K'.