Hello K! It is a mini 6152/1 so I think they are 45mm. The dial used on them is 36.25mm so using a 35mm lumi dial leaves a gap that can be filled with lume.
Yep, the dial in my 47mm case is a 38mm.Thanks mate, I had the impression that dials of 1950s were slightly bigger than standard Luminors, I guess this confirms it!