I thought I might add a little to the collective forum knowledge: Recently managed to pick up a close-to-nos jaeger dial (it's 31.8mm), and I could only find 2 similar-but-not-exact looking references in Sala. Seems to fit a mid-largish sized case 35-37mm. Might be an interesting project for me.
Others can feel free to correct me, but I have a suspicion that the dial in question is not correct. The "Jaeger" script looks too dark and not entirely neat. I would say there's a chance this did not start its life out as a Jaeger dial. Or it could have simply been redone.