Belgium
Typography is basically the font style used by the principle designer of the stamp. Many older stamps have a distinct font that makes them more collectible than other stamps even of the same time period.
Western Australia
Typography is a very highly specialized aspect of collecting stamps and I have not come across many collectors who assemble their lifelong collections along these challenging lines. You truly have to have a love for print-type more than art, subject, history, topic, country, geography or personage.
Ecuador