The first is the only real coin I have which is dated "1776." It's British guinea, which had a value of 21 shillings. The coin got its name from the source of the gold when went into the first examples. This "1776" half penny is a counterfeit. It was not struck in that year. And this is not dated "1776," but it commemorated the Treaty of Paris which granted the United States its independence. This Libertas Americana medal was conceived and paid for by Benjamin Franklin. Franklin gave two gold pieces to the king and queen of France (both lost probably during the French Revolution), about 50 pieces in silver and 200 in bronze. This is rated #1 among America's greatest medals.
Very nice Libertas Americana, I have a couple of tokens of it, nothing special but they still bring in a steady prices. I left a link on the design as I was surprised to find Ben Franklin had commissioned the medal and described in detail how he wanted the reverse design to look. Your gold guinea is a beauty, I've tried to buy one bidding but only the 1/3 as they are too pricey for me. https://www.si.edu/spotlight/comitia-americana-medals/libertas-americana