I promise that,
I do not take offence to Sheep Jokes.
My gumboots are bigger than that!
I reckon

This is a belt buckle, somewhat squashed, lost its 'pin'
One of the thinner 'sides' (left thin bit) shows triangulation where the pin might rest, the other thinner side - on the right of pic
has a 'stain' exactly in the middle where the 'pin' would be hinged.
As always, my comments are open to criticism
Unless you're an Aussie - in which case, I will
expect it as a matter of course - and give back as much,
to our ANZAC brothers and sisters
with much fondness
naturally- and Hey Sherm!
Cheers, Mike