Here is another Nishiki Racing Master I was lucky to get my hands on. It's not as awesome as most of the bikes in here, but I quite like it! It's Tange 5 tubing, and Suntour Accushift 4050 gears. Breaks are Shimano EX500.
The serial number is WBT1 074D, but it is a european model, so I don't know if it's any help :-)
Bought it for the equivalent of 87 bucks, and sold for 382. That's a pretty nice profit.