1931 UK Penny and some current $$

Did an hour this morning......It was freezing....sheesh the weather changed fast

Average hunt with a little bit of everything :)

 Cheap  ring,Aussie coin...Rupert the Bear?:)

Asian aluminium Coin....have not checked what it is yet

Is the button from the NZ Air Force maybe....anyone out there know?....I have found one before but could only make out little bits as it was well corroded,this is in a little better condition.
Looks like a Crown up the top and some bird at the bottom...