Most likely a promo shirt for the F1 Grand Prix that was held in Adelaide, Australia from 1985 to 1995 before moving to Melbourne, where it has been held ever since.

Zone Name	Shipping Method
United States (US)	Flat Rate ( 18 $ )
Canada	Flat Rate ( 18 $ )
United Kingdom (UK)	Flat Rate ( 18 $ )
Mexico	Flat Rate ( 18 $ )
Europe	Flat Rate ( 18 $ )
Asia	Flat Rate ( 18 $ )
Australia	Flat Rate ( 5 $ )
Everywhere