The first British Colonial postage stamps were issued in Mauritius in 1847. These are the famous Post Office issue, so called because of the inscription in the left margin. The design and colours were based upon the stamps of Great Britian of the same period.
Some of the 1d stamps were used on covers that contained invitations to a ball organised by Lady Gomm, the wife of the Governor. Three such covers exist today and are of the first importance in philately.
Only 14 copies of the 1d orange-red and 12 copies of the 2d deep blue are known to exist today. These stamps are some of the most famous and important of all philatelic rarities.