I just picked up a Centurion Omega. I am unsure where to look for the serial number. I checked inside the left chainstay, and underneath the BB, and have found nothing so far.

The bike has Suntour 7 front/rear derailleurs, and suntour "power shift" shifters. Also Dia Compe brakes. I have images of all the components here: http://crast.us/james/photos/albums/Misc/Centurion/



If I find the serial number, I'll edit it in here