Used stamps exchanges.

I collect worldwide used stamps. I also collect covers with nice commemorative stamps. Please do paste a few nice stamps on the envelope and I will do the same too.

I don't collect CTOs, Germany, UK, USA, Australia and small definitive stamps. I'm trying to complete the album "A Stamp for Every Country" and missing the stamp from the following countries:-
1) Eswatini
2) Montenegro
3) South Sudan
4) Turkmenistan
It would be nice if you can include a stamp of the above countries if you have any.

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