First of all, I've been to vintagecannondale.com

Each of the chain-stays has a number etched onto the bottom. Here are the numbers:

65608913967 and B1-0302

If I am interpreting the serial #s correctly, based on the website, the bike is 56cm made on 08/1991 with a 126mm drop-out spacing, but what does the B1-0302 number represent and exactly which model is it? Looking in the 1991 catalog, I can't seem to figure out which model it is. Mine is bare aluminum with the logos (perhaps someone could have possibly stripped the paint).

The bike has a shimano full size chain-ring (not sure which model), "shimano 600" front derailleur, shimano xt rear derailleur, suntour downtube shifters, the brakes don't have labels, but no quick releases. I've had the bike for over 10 years, purchased used and I'm going to sell it, but first I need more info on which model it is, etc. Any help would be awesome.