The British Society for the History of Mathematics and the Portuguese Mathematical Society have constructed this website in 2015 as a joint venture, which currently features 100 pages of mathematical stamps (about 500 stamps in total) with mathematical and historical commentary, for use for illustration purposes by mathematicians and teachers around the world. Initially the commentary is in English and Portuguese, but the site has been designed to allow other language versions to be added in due course. It is hoped that other mathematical societies, world wide, will wish to contribute.