1963 5512 with 2 line gilt chapter ring exclamation mark dial but 1560 movement?

[MikeyL]

Hi Folks,
I've been offered a very nice condition 1963 5512 with a 2 line (in gold) chapter ring exclamation mark dial but with a 1560 movement. Having done my research, this watch should really have a 1530 non chronometer movement but there does seems to be some cross over during this time both with dials and movements. My hunch is that the dial is carry over from 1961/1962 and they'd started using the 1560 by 1963 or the original 1530 was replaced with 1560 during a service. Any views gratefully received!

Mike