BLG chart, page-344

they issued a third of the mkt cap 2 raisings ago at 3.2c plus the free attaching options which we also can count on as cash from exercising and then a bunch at 6c raise. I guess shares on issue jumped by a third also plus some for the 6c raise. Probably 40% more shares on issue now than in 2019. Now just multiply it by the share price back then and you will be close.
Just under a billion shares on issue back in 2019 at 25c each gets you a mkt cap of $250m being the highest price in that year or $100m at the lows