Picked this one up utterly filthy with wrist crud. when I cleaned the case I was quite surprised that it shows no plating wear. Yellow gold plate with a stainless back and non-lume face with minutes track showing a number every 5 marks. Non-lume hands. Overall a nice watch and keeping time. Based on color, wear and aging, the band could quite possibly be the original.
1950 Duo Wind "F"
Referenced ad dated 1950