As part of the British Empire, Guyana's flag was a BritishBlue Ensign with the colonial badge in the fly. An unofficial red version was used at sea. The first flag was introduced in 1875 and was changed slightly in 1906 and 1955. Like all British Ensigns, the colonial flags of Guyana were all ratio 1:2.
The Presidential Standard of Guyana came into effect by Proclamation issued on 23 February 1970. Subsequent Presidents have amended this Proclamation to replace the description of the flag contained, to reflect the Presidential Standard they wish to introduce for the duration of their Presidency.
Presidential Standard of Guyana 1970-1980. Current Standard as of 26 May 2015
Presidential Standard of Guyana 1980-1985 under President Forbes Burnham