Do you have any pics of the seat cluster? If you click my sig you can see one of my bikes, a Colnago Sport. It was apparently Colnago's low-end entry bike to meet the demand of the bike-boom but it was only sold in Canada. It is a good bike and has some nice lugs but is nowhere near as fancy-ass as some of the higher-end Colnagos. Maybe you have something similar that was marketed for the Australian market?

There was one Colnago Sport recently on ebay but I cannot figure out how to search for items that have ended; the seller had some great detailed shots of his bike, maybe someone can help us out and show us how to search ended auctions?