This 2016 $20 fine silver coin pays tribute to Canadian patrols that were assigned to counter the U-boat threat in Canadian waters.  Mintage is limited to just 7,500 worldwide.  As a pure silver coin issued by the Royal Canadian Mint, it is GST/HST exempt.

The Design:

This $20 fine silver coin by Canadian Artist Bonnie Ross features a map that outlines the shores and major waterways of Eastern Canada where U-boats sunk or destroyed vessels during the Battle of the Gulf of St. Lawrence.  The minesweeper HMCS Drummondville of the Royal Navy is in the foreground, with the pennant numbers “J253” clearly visible on her starboard side.  . This coin is struck in one full ounce of 99.99% fine silver.