I've been interested in numismatics, mints that have some bragging rights for instance world's largest gold coin, world's first platinum circulating coin, world's first bi-metal, tri-metal etc.
Here's some of my thoughts:
World's largest gold coin record trend:
http://lunaticg.blogspot.com.au/2011/11/worlds-biggest-gold-coin.htmlWorld's first platinum coin was officially struck for circulation - Russia 1828 3 ruble
World's first tantalum (bimetal + silver) coin - Kazakhstan 2006 500 tenge
World's first antimony coin - China 1931 Kweichow 10 cash
World's first palladium coin - Sierra Leone 1966, set of 3 coins
World's first titanium coin - Gibraltar 1999 5 pounds
And so on. List can also be the world's most expensive coin of it's catagory. Would like to see interesting records.