The 1966 Bahamas 9-Coin Proof Set features a mix of precious metals, with the four highest denominations ($5, $2, $1, 50¢) in silver (Sterling or 0.800), and the lower coins (25¢, 15¢, 10¢, 5¢, 1¢) in Copper-Nickel, Aluminum, and Nickel-Brass, showcasing Queen Elizabeth II and Bahamian fauna like Marlin and Flamingos, all minted by the Royal Mint. 

Here's a breakdown of the compositions by denomination:

• Silver Coins (Sterling Silver - 0.925 Fine):
  • $5 Dollar Coin (National Arms)
  • $2 Dollar Coin (Flamingos)
  • $1 Dollar Coin (Conch Shell)
• Silver Coins (0.800 Silver):
  • 50 Cent Coin (Blue Marlin)
• Non-Silver Coins:
  • 25 Cent Coin (Copper-Nickel)
  • 15 Cent Coin (Copper-Nickel)
  • 10 Cent Coin (Copper-Nickel)
  • 5 Cent Coin (Aluminum)
  • 1 Cent Coin (Nickel-Brass) 

This set includes a significant total of about 2.87 ounces of pure silver, making it a popular collector's item.