vintage Celtic intricate knot work design on metal pin flaws

vintage Celtic intricate knot work design on metal pin flaws. Ruler in quarter in pictures to help with size visualization. Looks like birds to me in the design see third picture for a closeup of design. Questions are always welcome. There is definitely patina to the pin most likely due from being handled through the years see last 2 pictures for a closeup of condition to expect. I often wore this on my wool scally cap from Donegal Ireland , my beautiful Patrick Francis wool scarf ( which was sold here on Poshmark), or my wool tweed jacket. St Patrick's Day, Vintage, pin, Celtic, I always thought the birds were eagles which in In Irish symbolism, " the eagle holds deep cultural and mythological significance, representing wisdom, power, strength, and keen vision " .