Klaus Groh (born 1936). "Lady blue".
Collage with zipper and other parts on board, titled and signed '83 on holder, verso with stamp of the artist, wrapped in plastic with again the signature of the artist and date '83, 28 x 18.5 cm.
On Klaus Groh, see: https://tinyurl.com/mzlzern. This collage was sent in 1983 to Tjeerd Deelstra, the envelope has been preserved. In the envelope also an accompanying letter to Deelstra, a long list with solo (exhibitions) where Groh exhibited, a book on his "Istallationen" (1983) and another signed artwork (mail art): "10 important envelopes from 10 important letters received by Klaus Groh", consisting of envelopes stapled to each other.