Programme cassette <b>R0111 Grundkassette (base cassette)</b> for the East German home computers  <a href="https://en.wikipedia.org/wiki/Robotron_KC_87" class="extiw" title="en:Robotron KC 87"><b>Robotron Z 9001</b> (later renamed into <b>KC 85/1</b>) and <b>KC 87</b></a>, manufactured by the <a href="https://en.wikipedia.org/wiki/Robotron" class="extiw" title="en:Robotron">VEB Robotron</a>-Meßelektronik "Otto Schön" Dresden.
Hans Wollny
Attribution
The author sent the photo to me.