This actually wasnt something sent to me, but to my neighbour who used to live across my house and who had probably had a penpal in DDR back then. Since both she and her mum knew that my mum was interested in stamps, they gave her a number of envelopes years ago. And of course, it is me who had inherited them :)
It actually feels special to own these, coz personally
There are three stamps on the envelope, issued in 1980.
The small green one on the left is a definitive from a set of 3 representing Birds, while the other one is also from a set of 3, dedicated to the Olympic games in Moscow, representing Judo.