http://www.watoday.com.au/money/aus...dollars-showcased-online-20160923-grn1fe.html
"It's a fascinating coin," she says. "Nothing matches it for interest from the public. Everyone admires the Holey Dollar."
The Macquarie Bank certainly does. It uses a stylised image of this coin as its corporate logo.
Exactly how many remain is a mystery. One estimate is that there are about 300 100 in museums, 200 in private hands. Fifty have already been photographed for the Coinworks project. Owners of unrecorded examples are encouraged to contact Downie via the coinworks.com.au website. Details of provenance, quality, weight and size will be documented on a stand-alone Holey Dollar website to be launched later this year. The owner's identity will not be revealed.
These coins date to 1813 when Governor Lachlan Macquarie, faced with a cash crisis, decided to create his own currency by modifying a selection of Spanish dollars. He did this by punching a hole in the centre with New South Wales and the date stamped around the inner circumference. The original Spanish identification is on the outside, giving these coins a unique dual personality.