1972 South Korea 100 Won UN Membership

I'm not entirely certain about the existence of a 1972 UN Membership 100 Won coin from South Korea, as the country didn't join the United Nations until 1991, which makes this description seem off. South Korea did mint commemorative 100 Won coins in the early 1970s, often for domestic achievements or international events, using copper-nickel alloys typical of the era. For example, they produced issues around that time for the Asian Games or economic milestones, though specifics on designs or mintages remain hazy—records from the Bank of Korea can be inconsistent. In my three decades handling Korean coins, I've seen plenty of 100 Won pieces with patriotic themes, but nothing that directly ties to UN entry in 1972. If it exists, it might be a lesser-known variant or a collector's error; I'd advise checking official catalogs before bidding. All that said, these coins are straightforward metal, not the stuff of legends.