"... the Madrid Collection, arguably the foremost collection of Australian Proof and Pattern coinage in the world. The 50 items are valued in excess of $12 million. These will be sold privately, not by auction, in stages over the next few years. The first series of coins is available (see https://www.madridcollection .com.au) ..."
also mentioned - 1802 Madrid Holey Dollar 1926 Proof Penny 1926 Proof Threepence Proof 1930 Penny
and a report of a recent auction: "... A bidding war took place over a lot of eight 1966 20¢ pieces with a slight flaw on the numeral two. These sold for $12,349 (including buyer's premium), way above the $1000 estimate."
Those coins were wavy 20's, they've all been sent to PCGS and all slabbed high MS. Check out the population report, there were only a couple of coins graded 6 months back.
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