Very nice watch and nice picture !
The provenance and the box :shock: - well done catching that.
Regarding polish or not I 've found that some watch crystals from that time doesn't respond as good on polishing as later ones. I might be far off on this, but compared to a standard crystals from the 50s my feel is that at least some of them are not hexalite. (And their not mineral either) did they make them in celluoid.
Cheers and thanks for sharing
Neve