Everything about the appearance and specification of this neat, 155 mm x 800 mm gap-bed backgeared and screwcutting lathe says: "Germany, 1920s". Indeed, it's almost certainly by Oscar Ehrlich, but as yet unconfirmed. Of particular note is the effective built-on countershaft that uses a system of jockey pulleys to tension the flat belt.
The lathe was sold in Sweden by Corin & Linder AB of Gotenborg.