Claim: 1 pun (a 95% copper and 5% aluminum Korean yang coin ) is lighter than a 6.9 grams 5 pun (a cognate of a Chinese word, fen, which is equal to ​⁄100 yuan).
Evidence: Fun (pronounced "pun" but spelt with an "f" on the coins), is also a cognate of a Chinese word, fen, which is equal to ​⁄100 yuan, whilst hwan is a cognate of yuan itself. 1 pun
(一分) Brass
(95% copper and 5% aluminum) 5 pun
(五分) 3.3 98% copper, 1% tin, and 1% zinc 6.9