I just acquired this 4 RBS Thiele II with Altona cancellation. It has certificates from Lasse Nielsen and Carl Aage Møller, but neither describes further about the strike, other than it's a "rammestempel". I checked in my literature, but all listed rectangular-ish strikes from Altona seems to also have a date inside - this one does not - I cant even spot any ink remains, from what could have been a worn-out date mark. The stamp was issued in 1853, so the strike is probably from 1853 or 1854.
I would be happy if anyone could help to identify this.