1974 Cook Islands 9-coin proof set is a scarce, low-mintage collection of sterling silver. 925 coins, produced by the Franklin Mint, featuring Captain James Cook and Queen Elizabeth II designs. Valued by collectors due to its silver content and limited availability, with high-grade, graded examples being especially sought after. Silver Content of the two large silver coins described below add significant intrinsic value. Cook Islands – 1974 – Silver Proof Set. 1974 Proof Coin Set. 1974 Silver Proof Coins (As Below). Value: 2 1/2 Dollars (2.5 NZD). Weight: 27.3500 g. Value: 7 1/2 Dollars (7.5 NZD). Weight: 33.8000 g.