Tn the small goldies are $2 the large are $1 50c 20 10 5c all in there we ditched our 1 and 2c coins back im the late 80s early 90s still find plenty.the older folks with there deepseekers and coinmasters cleaned out a lot of the pre decimals. Still i find a gew of them too il put some up but having issues uploading photos at the moment.
GB hello id say you are spot on in your analysis of the button i thought it odd to have any detail on the back. As for composition, I scratched it when retrieving it which exposed silvery colour so that was the trifecta as far as value loss along with the button conversion. In any case it was very out of place location wise.and curiosity has been bitting simce i found it. Again right on too its oddities like this that keeps me keen.