For many years, the Irish Philatelic Bureau has been sending out bulletins, effectively newsletters, which inform customers of new issues and general news.
The photograph shows newsletters from 1980s, 1990s and 2013. I note that in 2012 and 2013, there are four issues now called “The Collector”. Earlier newsletters were issued sporadically during the year and may have featured just one or two issues.
The booklet gives information about a new issue….photograph, date of issue, values, designer, printer etc. There is also some text giving background information on the person, place or event commemorated on the stamp/s. I have several of these booklets …and I have duplicates of many.