Reverse: Along the rim on top, "CANADA". In the center, the Sambro Island lighthouse with impressive clouds in the background. On the left of the tower, the metal purity, "9999". Along the rim at the bottom, "FINE SILVER 1 OZ. ARGENT PUR".

Obverse: Along the rim on top, "ELIZABETH II". In the center, the portrait of Her Majesty Queen Elizabeth II. Along the rim at the bottom, the inscriptions “20 DOLLARS” and "2004".

Three years after the founding of Halifax in 1752, 26 families settled and worked on Sambro Island after Governor Edward Cornwallis saw the need to populate the area with British settlers to prevent a French attack by sea. During the 18th century, ships that sailed into Halifax faced a dangerous proposition. The port was often fogged in and more than 30 shoals lay in wait - with no lighthouse to show the way. In 1758, a tower was built on Sambro Island, with a fixed oil lamp burning at 35.1 m (115 ft) above sea level. Today, the tower is 25 m (82 ft) high. With it’s original granite walls still visible inside, Sambro shines as the oldest working lighthouse in North America.