Hello everyone, I'm trying to help. When I took the photos of the ship I could see that part of the hull was welded and part was riveted. so I think that the object consists of several ships.
Mfg Eckhard

In my opinion this is not the ROLAND VON BREMEN. Bow, bridge, bridge-wings, etc do not match, RvB was 15.72 m width, this vessel is clearly smaller. On the suggestion under an other photo that she was a former "Seebäder", I can not find any resembling vessel in my large collection of German postcards. What that she was a coaster / small cargo vessel and arranged in such a way that was suitable for the new owner, including the logo?

Not the right funnel shape either, I think - see https://www.shipspotting.com/photos/3616970

What other ships were broken up up by Hansa Rohstoff (or someone else) at Bremen in around 1985?

According to the following link, this is the bow and bridge of the ROLAND VON BREMEN (ex-RIO GALLEGOS, INDIAN REEFER) of 1939. The bow tip is certainly consistent, but I'm not quite so sure that the bridge is a match to that vessel.
http://www.duene1.de/homepage/weiss08/weiss18.htm

Looks like …Mystery Museum Ship …