No I didn't ask on here, maybe I should have as it could have saved me a lot of trouble
From how hard it was to find one I suggest you hang onto it if you repair a lot of phones, most of my enquiries were dead ends!
Interesting that the bottom part of your model is more a rim than an actualy bell set cover, I wonder if that was originally due to the magneto being fitted between the two? All of my phone casings are marked with the same stamping as yours which suggests that they originally went together, quite interesting as to how many variants there are of these models.