All of the 1961 trucks that I have owned/own (4 total)have had the window frames. 3 were Chevrolets and one was a GMC. One was a one ton Chevy series 30. And the others were all half tons. I have looked at many 60-63 trucks over the years and honestly can't remember one that did NOT have the window frames. I do realize that it was "optional" to not have the frames, I just can't recall seeing one without them. (my use of the word optional is meant as "possible", not as an RPO)
