Keith Miller was Australia's greatest allrounder © Getty Images

A baggy green of Keith Miller will be auctioned alongside three other Australian players' Test caps in Melbourne on June 28. The hat of Miller, who died as the country's greatest allrounder in October 2004, is expected to receive bids of $20,000, according to AAP.

The caps of Tim Wall, the fast bowler who appeared in 18 Tests from 1928-29 to 1934, Wally Grout, the great wicketkeeper of the 1950s and 1960s, and Geoff Dymock, the Queensland left-armer, will also be offered. "In any given year, we might auction around three or four baggy green caps, which are as close to the holy grail of Test cricket as one can get," Charles Leskie, the auction house representative, told the news agency.

Miller retired from Tests in 1956 after playing 55 matches, taking 170 wickets and averaging 36.97 as a batsman. A signature of Fred Spofforth, `the Demon' who earned Test cricket's first hat-trick, is another of the 420 lots of sporting memorabilia for sale.