Even if YOU aren't sure I would leave it here, as looks interesting.
As I've chcked some pics the Kemna looks quite similar also the location fits well (as seems they were made before the war in Breslau).
Kemna produced in Breslau, today Wrocław, until 1945. The Kemna steam and later combustion engined road rollers were widely known throughout Europe, but only few survived.