The <b><a href="https://en.wikipedia.org/wiki/A_5120" class="extiw" title="en:A 5120">Robotron A 5120</a></b>, an office computer which was manufactured in the GDR (East Germany) by the VEB Buchungsmaschinenwerk Karl-Marx-Stadt (belonged to the <a href="https://en.wikipedia.org/wiki/Robotron" class="extiw" title="en:Robotron">Kombinat Robotron</a>). First introduced in 1982. This is a very rare variant called <b>A 5120.16</b>.
Enrico Grämer
Attribution
The author sent the photo to me.