Created in 1964 and introduced at Baselworld a year later, the Corum Coin Watch was innovative in its construction: a coin was sliced in two to form the case of the watch, with the movement sandwiched in-between. To mark the 50th anniversary of its introduction, Corum released a pair of limited edition Coin Watches. These anniversary Coin Watches feature mint, uncirculated coins struck in 2014, exactly 50 years after the coins used in the original Coin Watches, which were struck in 1964. Corum has also utilized vintage coins for its Coin Watches, such as the enamelled Indian Head watch introduced earlier in 2015. The more unusual of the pair is the Coin Watch made from an American Silver Eagle coin. Measuring 43mm in diameter (the coin itself is 40.6mm), it is the largest Coin Watch ever made. This larger size caters to contemporary tastes, contrasting with the typically smaller Coin Watches.