I can see "BRITT" just to the left of the king's crown - which fits the Australian halfpenny theory. The only other countries I'm aware of that included "BRITT OMN" in the Latin legends were Britain itself and Jersey; British coins use an uncrowned portrait and Jersey is less probable than Australia, based on mintage.
And just to remind the North Americans: Australia never made "large cents". We made "pennies" and "halfpennies", and "cents".
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis