The Arthur W. Gray Collection, containing some 500 mounted sheets, represents a collection of the Kangaroo Issues of the Commonwealth of Australia which is believed to be the most complete ever to be formed.

The collection has attained International Recognition by being the first of any collection of Australian Commonwealth to have been awarded International Large Gold Medal Status. In achieving this distinction on three successive occasions at London 2000, Tokyo 2001 and Seoul 2002, it is likewise the first collection of Australian Commonwealth to have qualified for and been exhibited in the FIP Championship Class.

A summation of its exhibition record is as follows.

1. Australian National Exhibition “Stampshow 1998” Canberra (8 frames). Large Gold – Grand Prix, with Australia Post Award and Special Prize.
2. FIP World Exhibition “Australia 99” Melbourne (5 frames). Gold, with Australia Post Award for the Best Twentieth Century Exhibit and Special Prize.
3. FIP World Exhibition “España 2000” Madrid (8 frames). Gold – with Special Prize.
4. FIP World Exhibition “London 2000” (8 frames). Large Gold.
5. FIP World Exhibition “Philanippon 2001” Tokyo (8 frames). Large Gold.
6. FIP World Exhibition “Philakorea 2002” Seoul (8 frames). Large Gold.
7. American National Exhibition “Rompex 2002” Denver U.S.A. (8 frames). Gold (highest medal level achievable), with APS Award for Best Twentieth Century Exhibit and also Most Popular Exhibit Award.
8. FIP World Exhibition “Bangkok 2003” (8 frames). FIP Championship Class – Large Gold.
9. FIP First World Stamp Championship, Singapore 2004. Participant – Large Gold.
10. Australian National Exhibition “Swanpex 2004” Fremantle. Participant in Tri-Nations Challenge (5 frames) – Large Gold with Grand Prix of Show and Australia Post Award.
11. FIP World Exhibition “Pacific Explorer 2005” Sydney (10 frames). Invited Exhibit – Court of Honour.