Longines 1940s 10K Gold Filled Manual Wind Watch

Longines vintage watch. Both the case and the tops of the band are 10k gold filled. I dont have a micrometer with me but the case width is approximately 27 mm and the lug to lug around 39 mm. It is mechanical wind up and works. It was made in the 1940s and has wear as can be seen in the photos. Kreisler USA expansion wrist band.