For many specialties, we acquire new catalogs annually or every few years. This is not the case for worldwide postal stationery. The most comprehensive catalog is still the Priced Catalogue of Postal Stationery of the World, more commonly referred to as Higgins & Gage.
Member Richard Thompson recently lent us some supplements he had acquired that were more up-to-date than ours, and we are now confident that we have the most up-to-date editions and supplements available. Still, that means the most recent date on any of our Higgins & Gage volumes is 1986, more than 30 years ago.
Though the pricing, even with the supplements, is out-of-date, Higgins & Gage is in regular demand for its detailed listings and illustrations and comprehensive coverage. The numbering system is also used regularly.