The Royal Gazette/Bermuda Stock Exchange Index gained 12.30 points yesterday to close at 3,320.50. It was a slow day with investors of Butterfield Bank pushing down the price 50 cents to $41.50 after trading 628 shares. The only other stock to see any movement was Argus Insurance Co. Ltd. which gained 75 cents to close at $27 after investors traded 1100 shares.