Umezawa NJS Track bike

Umezawa NJS Keirin Track bike, never raced, White sparkle
53 x 55.5cm,
NJS BB, NJS Stem, NJS Hatta Headset, NJS Seatpost, NJS Seat, NHJ Nitto Handlebars and NJS Dura-Ace Rear cog.

FSA ck-633 F. Gimondi 48T crankset.

The bike is spotless. I build it about 3 years ago, took it to the track for few rides, and put away since. It's collecting dust, and I have my eye on something else now, so this has to go. I'm willing to sell without the wheels.

I put around 650 in it, without the wheels. Willing to go for 700 pounds, all together, or split pending interest.

Thank you

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Very random. I have the same bike, not as shiny or clean as yours, but same color and same make. I bought this bike off someone who knew nothing about it, so I too know not so much. Any ways I can never find any information on Umezawa bikes. I started doing some reasearch a good four years ago when I bought it but gave up out of frustration. For some reason I am back trying to learn more about it.
Do you know the year of this bike? Also do you have any information about the serial number? All I seem to have is 2 sets of 2 digit numbers that are not even next to each other. Sorry I am not interested in purchasing, just interested in someone who can tell me about this rare beauty.