That's A Beautiful 259, Hans!
I'm thinking it was the top of the line model that sold next to the 189 (midrange) and 153 (economy). The bag looks just like the ones on my 189 and 153. Front cover plate looks like the one on my 189, too.
I think Ben is close on the dates, but it could have been built as late as 1951 or 52. I know my 189 was built in 1946, as when I was working on it I noticed the month and year were stamped on the armature. However, it doesn't have the fancy motor housing like yours.
Jeff