"The Printings of King George VI Colonial Stamps" by W.J.W. Potter and Lt.-Col. R.C.M. Shel is an essential guide for stamp collectors. Published by D. Van Nostrand Co Inc, the book provides detailed information on the stamps issued during the reign of King George VI in various colonies of the British Empire. The book is made in the United Kingdom and is of the highest quality. This publication is a must-have for collectors who want to gain insights into the history of colonial stamps. It is a valuable reference tool that provides information on paper, gum, perforations, and watermarks used for printing. Every page is filled with detailed descriptions and high-quality images that make it easy for collectors to identify each stamp.