The 1964 extra water line on the Canadian 5 cent nickel is a mint error that occurred during the production of the coin. It is a small, additional line of water on the reverse side of the coin, just below the beaver's tail.

The extra water line is believed to have been caused by a worn die, which is a tool used to stamp the design onto the coin. The die likely shifted slightly during the minting process, causing the extra line to appear on some of the coins.

Only a small number of coins were affected by the error, and those that remain in good condition can fetch a premium price among collectors. #canadiancoins

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