|Research so far suggests it is a West German made Torpedo Blue Bird. Possibly the marque's last incarnation, from around 1964 (tw-db).|
Footnote #1: I wouldn't really expect a maths typewriter to have an exclamation mark, but it seems strange that it has neither 1 nor zero - both figure prominently in maths I'm familiar with.
Footnote #2: Given the genealogy this machine might share with the Imperial Good Companion 5, I'm planning a "compare and contrast" photo-feature soon. First impression? They are totally different machines.