Australian coins / sort a pile
You have a handful of coins and one question: which of these is worth looking at properly, and which can go in a lot together? Tick what you have.
Two things, and the second is the one that gets dropped.
How few were struck. Every issue is ranked by mintage inside its own denomination, so rank 1 is the lowest of that series. A coin in the lowest quarter of its denomination is called out. Rank is worked out only for issues that carry a figure, and never for a year where a document says no coin bears that date, because sending you hunting a coin that does not exist would be the worst thing this page could do.
Whether the date settles it. Some dates cover several coins that documents record as different, and then the date on its own tells you nothing. 41 issues are common by mintage and flagged anyway. The 1920 penny is the one to remember: 20th of 32 pennies by mintage, entirely ordinary, and the coin whose dot varieties you do not want to bag without looking. Sorting by rarity alone would have told you to bulk it.
What this is not. It is not a valuation, and it cannot become one. A price is a market's opinion on a day and no document states it, so this catalogue does not carry one. If you are selling, what you want is realised prices from recent sales, and you should go and get those from auction records: this page is for the step before, deciding what deserves its own listing.
And mintage is not survival. A coin struck in millions and then withdrawn and melted can be scarcer today than one struck in thousands and hoarded. This catalogue holds the withdrawal and circulation records that bear on that, and they are deliberately not folded into the rank, because doing so would invent a number no document states.