This absolutely gorgeous souvenir sheet depicts marine lief of Taiwan and its issued on 26.6.2018.
I received my first CCCC cover and this is also my first foreign mail after star of coronavirus pandemic. There's 4 stamps on cover, but only herb stamps are cancelled.
This is set Herb plants from 11.6.2013.
And there was also this Europa CEPT stamp set from Greece.
Thank you so much, Su!