I have a Schwinn Circuit with serial number 0717 on the head badge. I believe the year ends in 7 but unsure if it is 87 or 97. Flat black, chrome stays, forged drop outs with adjusters. It is a really great steel bike that is very light. I had help on another thread for the head badge serial number but would like a link to brochure and any other info would be great. Thanks, -billS