Fourth portrait of HM Queen Elizabeth II, when she was 77 years old, facing right and surrounded by the inscription. Date below.

Dei Gratia Regina (often abbreviated to D. G. Regina and seen as D·G·REGINA) is a Latin title meaning By the Grace of God, Queen.

Engraver: Susanna Blunt

A reproduction of Bell’s signature is paired with a portrait of the inventor in his later years, when much of his scientific work was done at his estate in Baddeck, Nova Scotia, Canada. Those experiments are represented by schematic illustrations of the Silver Dart—the aircraft that achieved the first controlled, powered flight in Canada—and the record-setting HD-4 hydrofoil; both crafts made history on Bras d’Or Lake, represented by the waves that are highlighted in blue.

The Silver Dart (or Aerodrome #4) was a derivative of an early aircraft built by a Canadian/U.S. team, which after many successful flights in Hammondsport, New York, earlier in 1908, was dismantled and shipped to Baddeck, Nova Scotia. It was flown from the ice of Baddeck Bay, a sub-basin of Bras d'Or Lake, on 23 February 1909, making it the first controlled powered flight in Canada. The aircraft was piloted by one of its designers, Douglas McCurdy. The original Silver Dart was designed and built by the Aerial Experiment Association (AEA), formed under the guidance of Dr. Alexander Graham Bell.

HD-4 or Hydrodome number 4 was an early research hydrofoil watercraft developed by the scientist Alexander Graham Bell. It was designed and built at the Bell Boatyard on Bell's Beinn Bhreagh estate near Baddeck, Nova Scotia. In 1919, it set a world marine speed record of 70.86 miles per hour (114.04 km/h).

Engraver: Chris Gorey (CG)