What Is Your List Of The Rarest Australian Coins.

Do you mean standard 2018 10 cents or the changeover version?

I have 3 and they are all changeover

2019 JC Fifty Cents COA are being offered on ebay,
typical price around $60.
Seems to confirm my earlier post:
mintage combined 2018-2019 and 2019-20 total is 70,000 pieces.

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Update:
Some dealers report that 5000 roll sets of 2019 dated JC coins have been produced. The 50 Cents roll contains 20 coins. That's a total of 100,000 2019 dated 50 Cents coins.
I do not know if the 70,000 total mintage in the combined Mint Reports is included in the 100,000 50 Cent coins produced for the mint rolls.

I've written this all before, but it's a case of " take it with a grain of salt " when reading and relying on the RAM's annual coin mintage site.

Interesting that so far the 2019 JC 50c rolls listed for sale are all RAM rolls and I'll be surprised if any 2019 JC 50c security company rolls ever appear. I could be wrong.

I'm of the mind that both the 2020 JC 50c and $1 MoR's could be/will be either only available in a limited number of RAM rolls ( maybe ? ) and/or, more likely, mint set only.

I think we'll find out by the end of December.