Semi concealed hinge ZDC black powder coated with steel pin
https://www.allbro.com.au/itemdetails/semi-concealed-hinge-zdc-black-powder-coated-with-steel-pin?category=hardware&code=302058b---17.2&type=2&access=2&id=91337fb3-04e7-4443-800b-ebcf74f08aa2