Helen,
It is a great find. I have been looking for a parallel but with no luck so far. I am no expert on British
fibulae and this is clearly a
Romano-British type. It appears to be an early
enameled bow fibula, earlier perhaps than the usual
Celtic trumpet design.
I have never seen enamel that vibrant. Frankly it makes me worry. Is it that bright because the finder was incredibly lucky or does such enamel quickly fade when exposed to the air and that is why we don't see more today? It should really receive some expert care to determine if it needs any stabilization. Will waxing assist by isolating the enamel from the environment or will it harm it? I don't know.
It would also be great to show it to an art historian knowledgeable in that era. Is the vibrant, today one would say garish, colouring typical of
Roman,
Romano-British or purely British-Celtic? To me it screams
Celtic but I am not expert.
Shawn