Besides the UPU, which tends to be incomplete, is there a simple reference source (besides Scott or Stanley Gibbons via omission) that states for a variety of countries that stamps that are purported to have been issued in a particular time period might be cinderellas?
My question arises after looking at stamps with fire appliances, or fire engines on
ebay. Besides the traditional countries, that have long standing, functioning postal administrations, there are quite a few that raise your eyebrows. One that came to mind was Djibouti in 2001-2003. Granted, the country had its challenges leading up to a compromise in 2000. Reading about the postal administration raises serious questions on their ability to issue some of the volume implied. Furthermore, checking what stamps Djibouti did issue in this time period, turns up an extremely limited set.
All this to ask, is there a quick reference guide? Personally, it is just how a particular field is filled in and not worry about it. I realise that while Scott and SG tend to be conservative, Michel and Yvert tend to list a lot that I can not find in the former pair.
Thank you,