1871Other Notes/Commentary: in original case.This large size American Institute medal is fairly common in silver and bronze and they regularly appear on eBay. But in gold, it is a different story - they are ext rare & I've seen perhaps 2 or 3 in gold in 50+ yrs whereas I've seen hundreds of the silver and even more of the bronze. This is a Gem Proof in gold and is ex PCAC auction yrs ago.gold101.344