I'm not sure what to tell you other than you should write a letter to Gruen complaining about model-name reuse.
So far, the ONLY match to the watch originally posted, the 440-449, is the image Kastner pointed us all to. It's the one from The 1940s book and matches the image you've posted from Dec 16th 1947.
I would bet money that if one was to overlay the image of the Curvex Cadet from the newspaper with a photo of the watch, the dimensions would match and the dial figures would as well.
We also know already that the Curvex Comet has a style number of 440-544, not 440-449.
I have only seen one image match the photo of the 440-449 watch posted and that's the Curvex Cadet advertised on Dec 16th 1947. I haven't found anything else that matches.