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Here's my Nishiki Olympic 12:
And here is its serial number:
The first picture was taken days before I wrecked it in February 08, bending the fork and buckling the down tube just behind the head tube.
But I thought I would share anyway. Using the decoder ring, I read KC21076 as the 21,076th unit built by Kawamura for the U.S. market in 1983. I think I bought it new in 1984 for about $250.