Rob and Mike, threads 11 and 12, all I can do is to quote the official Equipment regulations that Armourers who do these markings are apt to follow. I've laid my cards on the table for all to see and even published these findings, copied directly from them, in a little booklet form. And to date, no one has seen fit to inform/tell me to correct, alter, amend or add to it!
Let's see where this other info originates from. That's all anyone can ask, surely?
Reminds me of writing a book some time ago and having to include a chapter dispelling certain info that proved to be questionable. In this case, my source was from the Army Library, (Prince Consorts Library) at Aldershot. There may be other sources of course and the single Army library might not be infallible but I did have the actual regulation and updates in my hands