In 1840 the the Penny Black stamp was issued. This was the first stamp in the world.
The first postage stamp was issued by Great Britain on 1 May 1840.
Colombia government. Issued in 1960-1968
The "Penny Black" featured Queen Victoria and was first issued in 1840 as the world's first pre-paid postage stamp.
The Penny Black was the world's first adhesive postage stamp of a public postal system. It was issued by Great Britain and Ireland on 1 May 1840, for use from 6 May of that year.
The world's oldest stamps is from United Kingdom dating back to 1840. This stamps is a depiction of queen Victoria. This stamp is called The Black Penny Stamp. There are about 1.3 million issues still in collector's hands while the originals are worth around $100,000.000. per stamp. The second oldest is known as Ben Franklin #1 issue of The United States issued in 1847. This stamp ranges from $16,000.000 unused to $600.000 used. So the winner of the first country to produce the very first postage stamp is the U.K.
I don't know if anyone has actually counted, but it is most probably Great Britain's Queen Elizabeth II. She has ruled England for over 50 years and in that time has appeared on every British stamp issued as well as hundreds of others issued by the members of the British Commonwealth.
Switzerland
While it was printed for a new postage rate, Canada issued the first stamp referred to as a Christmas Stamp. It contained a picture of the world with the countries controlled by Great Britain in Red. It was the map issue of 1898 and said XMAS 1898 on the stamp and was issued on Christmas Day.A Star
The first stamp called the Penny Black was produced in 1840 in the United Kingdom. It featured a profile of Queen Victoria and was used to prepay postage. The Penny Black is known for being the world's first adhesive postage stamp.
The first stamp made was the British two penny black stamp from 1840.
The Scott company has cataloged every stamp issued in the world. A Scott number of 760 would indicate that the stamp is for regular postage and is about the 760th stamp issued by that country. It would typically need a country with the number. If this is a US stamp it is a 5 cent vertical format commemorative of Old Faithful with a value of a few dollars.