http://web-cache.stream.ne.jp/web/selector/suntory_viewer/user/wmt_b.html?cont=softdrink/ff/battle&band=b&player=wmt The Potion costs 200 yen. In the original Final Fantasy, a Potion was 60 Gil. This gives us our first-ever real-world exchange rate for classic Final Fantasy currency: .3 Gil to the yen. At the day's exchange rate, this makes $1 US equivalent to 35.3124 Gil. This means that the Silver Sword we saved up 4,000 Gil to buy in 1987 is worth only approximately $113.27.