KM 176.1 minted 30 000 000 worth 3.5 US in UNC. I have about 20 of them and this one is in best condition. It would indeed be stupid to fake this coin.
Talking about fakes. Here is a contemporary counterfit bird. In spanish "falsificación de epoca" made in a lead alloy. Looks like a vulture.
The White Heron from New Zealand has a weird edge with a line that goes around along the reeding, splitting it in two, top and bottom. http://www.wbcc.fsnet.co.uk/sub009d.htm
-No the Heron bird was minted in the Cayman Islands, here is the other side - The Ibis was minted in Trinidad -