Free Stamp Catalogue
According to its website, "Freestampcatalogue (FSC) is a world stamp catalogue free for everyone to use. Almost all official stamps issued from about 1920 to the present day are shown in the catalogue. However, this includes only stamps and blocks - no special items, misprints, varieties etc. The stamps are displayed per set, resulting in nearly 200,000 series and blocks. By using the filter function, you can find stamps sorted by country, theme or date, or a combination thereof."
It goes on to say, "FSC is built and maintained by PostBeeld, international stamp dealers located in Haarlem, The Netherlands. Items that are in stock are displayed with a PostBeeld selling price and an order button. PostBeeld uses the reference numbers of various catalogues (e.g. Michel, Yvert, Stanley Gibbons, Scott, NVPH)."
Due to numbering rights, FSC only publishes Michel, Yvert, Stanley Gibbons, Scott and other numbers for items that are on sale on the PostBeeld website.
Click here to visit Freestampcatalogue and PostBeeld.