This gold brooch is known as a 'birdlip' or 'beaked bow' brooch due to the characteristic protrusion on the bow. The two circular features above give the impression of a bird's face.
The brooch has sadly been damaged in the ground, and the bow has become bent. The pin is also missing, and would have attached beneath the trumpet above the bird's head.
Examples of Iron Age brooches in gold are exceedingly rare, with less than ten known from Britain. Interestingly, one of the other examples is a gold brooch of similar form from Market Rasen, now in the British Museum.
Courtesy of Lincolnshire County Council, The Collection