What is the value of an Australian double headed penny with no date?

Answer 1

It is extremely unlikely that a doubleheaded 1943 Australian Penny was struck, much less made it into circulation, and there are no known occurrences of it. If it is a genuine doubleheader, you would not be able to see the date. However, if you do have one, you probably have a valuable curiosity. Double-headed coins turn up in American change all the time. They're called "magicians' coins" and are simply novelty items made in a machine shop by splitting apart 2 genuine coins, then switching and rejoining the split sides. They sell for a few dollars in novelty shops but have no interest to collectors. It's not at all impossible that the same kind of items would be created in other countries.

Answer 2

There is no documentary evidence of a "double headed" Australian Penny. It is possibly a trick coin from a magic shop.

Any coin with a "genuine" minting flaw would have some value, above the usual, as a collectible coin.

Genuinely flawed coins are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the minting process, and have escaped detection during quality control at the mint therefore, a valuation cannot be anticipated.

A reputable coin dealer should be able to identify and confirm the coin as genuine and make a valuation.