Quote:
Its amazing (to me) how some countries had so many pre-cancelled stamps out there, while other countries did not. I wonder why?
Suggestion.
It may be linked, both to population and the state of commerce in those particular countries.
Subsequent to the penny postage, mail numbers exploded, one could expect countries like the US and their mail-order businesses, to require a process that did not require the standard Post Office regime, pre-cancelled stamps fitted the need.