Metal clip with viking ship on one side and birds on other. What is it?

I recently bought a jewelry box at an estate sale.  Lots of costume jewelry, some real gold, and a very nice box.  (The box is a Lane cedar chests Altavista, Va. Presented by M.C.M. furniture Appl T.V. inc Leominster-Fitchburg, Mass.   The box alone is a nice find, BUT what caught my attention and made me buy it was a beautiful clip.  There is a viking ship on one side and on the other side birds.  It doesn't feel like a hair piece.  It weighs 3.3 oz, and is 4 inches long.  A magnent does not stick to it.  It seems to have enamel I assume for the colors.  It needs a very good cleaning, but I am afraid of messing it up.