Fairly spontaneous incoming by post today, as I haven't been able to see one to try in a jewellers so this was bought according to the limited online photos!
I seem to have a thing for watches that have an interesting side profile and this one doesn't disappoint with the slight gap between bezel and case for the push-down-to-unlock mechanism and the oversize "nut" surrounding the crystal adding extra depth. 80 hours power reserve, slow(er) beat movement adding to the retro feel albeit with a Nivachron balance spring to reduce the worries of magnets as on my older watches.
I present the Certina DS Super PH500m :-)
Ant