Then I obtained this photo. Hey, it's the same tie, always a good way to identify a photo. And the books in the background are the same as in the photo above. Gotta be from the same photo shoot.
And taking it one step further, the use of shadow on Bob's face reminded me of this gorgeous photo by M. B. Paul, who worked for Columbia pictures. It was taken in 1941 for use in the publicity campaign for Mr. & Mrs. Smith. Yup, same tie and jacket. The use of shadowing prevalent in all three photos. Same sitting, three great photos. (For the record, I've seen an original of the middle photo. My copy is a bit washed-out, the jacket is way too light. I'm sure Mr. Paul's photos were a challenge to print.)
Paul's photos are very flattering of the 37-year-old Montgomery. Wish he had worked for MGM, really nice work.