I have been collecting EGAs and covers since I retired from the reserves in 1990. Unfortunately I have not gained a great deal of expertise in the process. I am sure that some of my collection consists of replicas that were sold as the real deal. I have often bemoaned the lack of a good reference work and have even at times toyed with the idea of producing one. However my limited ability to discern real from fake as well as a lack of the technical information has convinced me to leave that project to someone better equipped.
What I have done is to put together a powerpoint presentation showing as best I have been able to determine, a chronological history of the early insignia (pre 1868) and the EGA major variations. It is a work in progress with many gaps and I am sure some errors which I hope I can correct given time and a good reference to draw on. Like many others on this forum, I look forward o being able to purchase your book.
another retired aviator