I'll digest that in due course, still a right novice on AMG
I have the US sets, but had not a great deal of interest,
until finding the Travel Permits stamps.
Didn't realise their (AMG) wide usage.
Besides registry they had COD, special delivery, postage due, courier mail, postal cards, and postal checks.
Great thread PostageDueGuy, thank you for posting it.
No problem and more to come on registered mail!!!