As I only collect Canadian issues, I'm requesting any assistance on these stamps.
I think that the USA pair must be for Government use (just odd that someone had two identical issues but only one was faded).
The Trinidad surcharge is damaged, but I'm thinking that it must be fairly old as it does not include Tobago.
No idea what country/colony the remaining stamp is from - perhaps Austria?*** Moved by Staff to a more appropriate forum. ***