Blue lines are mostly used in the British Commonwealth. I've seen very few covers from the U.S. or other countries that use the blue lines for indicating registered covers.
I have never discussed them before, and I am not sure they come with a correct name. "Registered letter Crayon Lines" would always convey to others what you mean. The early lines both blue and red in Australia, were waxy crayon. I can still recall my local postmaster and clerks, melting the lake coloured wax and placing it on the srings of parcels, and the resultant smell.
It seems that for the most part, blue registation lines are seen on UK and Commonwealth (and former Commonwealth) covers.
However, I don't recall ever seeing them in use in Canada, probably because we are right next the the US where they are also not used.
Strangely enough, they do use them in Ireland, despite the fact that Ireland's independence from the British Crown was a long drawn out and messy affair; one would think that they for sure would not use what seems to be a British tradition.
All right!! Thank's for helping me with the correct verbage and definitions. Etiquette label = airmail label. Well I might as well show off my employ epileptics etiquette label.
The same etiquette label is also on the back. Here's a close-up
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