but the engraving created for those banknotes excluded the tiara. $50 note The $50 note is red, and the obverse features a portrait of William Lyon Mackenzie King, the Prime Minister of Canada between 1921 and 1930 and again between 1935 and 1948. It is based on a photograph in the collections of Library and Archives Canada. The building in the holographic metallic foil is the Centre Block of Parliament Hill, based on a photograph commissioned by the Bank of Canada. The reverse features images focusing on the Canadian Coast Guard Ship Amundsen in the Arctic, reflecting Canada's northern frontier and its role in Arctic research. The image is based on a photograph commissioned by the Bank of Canada taken on the Saint Lawrence River near the Canadian Coast Guard base in Quebec City. The syllabic text "ᐅᑭᐅᖅᑕᖅᑐᖅ" appearing above the image of the ship is the Inuktitut syllabic representation of the Inuktitut word "ukiuqtaqtuq", meaning "arctic". The background contains a simplified adaptation of a map of Northern Canada provided by Natural Resources Canada and an artistic rendering of a navigational compass. The banknote was unveiled and released into circulation at a national ceremony at the Canadian Coast Guard port facility in Quebec, and also at several regional events, on 26 March 2012. CCGS Amundsen was docked at port for the ceremony. It was nominated for International Bank Note Society Banknote of 2012 and was ultimately runner-up to the Kazakhstani 5000 tenge banknote. $100 note The $100 note is brown, and the obverse features a portrait of Robert Borden, Prime Minister of Canada between 1911 and 1920. It is based on a photograph in the collections of Library and Archives Canada. The building in the holographic metallic foil is the East Block of Parliament Hill, based on a photograph commissioned by the Bank of Canada. The reverse features images focusing on Canadian innovation in medicine. In the centre is a drawing of a researcher or scientist using a microscope based on the Carl Zeiss AG Axioplan 2 imaging microscope. It represents "all the men and women who have contributed" to medical research in Canada. The bottle of insulin, based on a 1923 photograph of one of the earliest bottles of the protein, represents the discovery of the peptide hormone by Canadians Frederick Banting and Charles Best in 1921. Similarly, the electrocardiogram track of the beat of a healthy human heart