That is a really pretty one, looks like a elna grasshopper kind of... but less green. I'd be surprised if it wasn't a knee lever machine. There's a small hole on the base at the front which looks about right!
A lot of the manufacturers of Sewing machines got into it after the world wars, Husqvarna, Tavarno (elna) singer used war technologies for the first 201 and then aluminium alloy for the second from WW2. Zundapp too I think we're aircraft and then sewing, then motorcycles.
Thanks for sharing that's a gorgeous machine to see... very out of my price range tho.