T-Mar, you had to know that I would post on this thread, how could I resist.
I had three Nishiki road bikes. I picked up this Century about a year ago and have subsequently sold it. It's a basic, 10 speed with Suntour derailers, chrome rims, no QR's. The right dropout had a Giant date number: G0683. According to my records, the serial number is 3159531. It rode real well for an entry level bike. I noticed it's nearly identical to brandenjs's Century.