Countries Who Don't Put Their Names On Stamps

A post yesterday reminded me of a question which I am sure has been pinged around this forum before: which countries don't routinely put their names on stamps? There are any number who didn't to start with: Prussia, Portugal, Spain, Switzerland, Denmark, Finland, Brazil, Uruguay, Iran to name but a few, but as far as I can make out there are only two who didn't / dont: Imperial Russia and Great Britain.

Can anyone think of any others?

When I started collecting I was told, or I read somewhere that stamps of Great Britain are the only ones allowed to go without the country's identification as a tribute to the fact that the postage stamp was 'born' there. The issuing country's name on postage stamps is supposed to be a UPU rule.
As I indicated on TimH's other post I believe that postage due stamps do not carry this requirement, hence these stamps generally are not identified with the issuing country's name.

Peter

And ... the United States (Pilgrim Tercentenary set of 1920, Scott #548-50).

Here is a thread I started a few years back :

https://goscf.com/t/7401#7401