Yeah, that's a little disappointing, but certainly no show stopper on this still excellent watch. It's funny too, in the movements I looked at that did have the chatons, they were only installed in the 4 "going train" rubis just to the right side of the escapement. The rest of the jewels in the movements were all just like those shown in the photos you sent - and thanks too, for your responses!
At the end of the day, my Navigator will have the solid back (I already emailed GO and they told me I could no longer get the display caseback) and it will ultimately come down to what I know is behind it!
Best Regards - Phil