The bicycle appears pieced together. While most of the parts are Dura-Ace, the front derailleur doesn't appear to be, the Dura-Ace rear derailleur is one generation newer than the Dura-Ace brakes, etc. you can get the model designations and dates off the back of the components. Refer to the components page of the Vintage-Trek website for location and decoding. That will put you in the ballpark for age.
It appears to be very late 1980s to very early 1990s. Circa 1990 Daccordi offered two Dura-Ace equipped models, one the SL and the other, the SLX. The models were named after the utilized tubesets, at least in the USA. It's possible the Australin importer spec'd and/or named them differently