PSA submission advice about "marked" card

[steve B]

This is a case where PSA is clueless.

The unmarked ones are obvious, but many countries, especially places like this make a lot of money selling stamps to collectors. In most cases, the "cancelled" stamps will have full gum on the reverse, and have never been on a piece of mail. They're what's called cancelled to order. If you know how, you can buy thousands at a time all "cancelled". Sometimes the "cancel" is actually printed on as part of the design.

Something presented as issued shouldn't be stuck with a modifier or downgraded for something that was there from the beginning.