Yep, difference categories for collectors.
You will also need to be a member of a club - Give these a try:
Antique and Historical Arms Association of South Australia
PO Box 4
email:
pennag@netcon.net.au 01
Kent Town SA 5071
Arms Collectors Society - APSC
C/o 4 Pauls Dve
Valley View SA 5093
Port Lincoln Firearms Collectors Club
PO Box 201
Port Lincoln SA 5606
Heritage Arms Society
PO Box 552
Eastwood SA 5251
Couldn't find phone numbers... You can find them I'm sure.