This refers to a souvenir booklet that includes blocks or pages of stamps along with informational pages and illustrations. These are colourful and high quality. Some cover collectors like to specialise in PSB covers, where each whole pane is carefully torn out of the booklet, stuck on a cover and postmarked on the day of issue, producing a set of covers. Our PSB sets are usually produced in small numbers and make a very interesting niche in the collecting world. An example is this PSB set produced for the Jane Eyre issue in March 2005.