Ok I have had a read - very informative. How about this bit of my original post:
'Is it quite safe to set the time and turn the screw or is there risk of it sheering off? The 'screw' (time and date changer) is a screw tight one, is it quite safe to screw it tight? '
Ultimately, as I appreciate these are replicas, is the movement pretty strong like any other watch, can it be used every day and are there any other physical handling characteristics require, like being ultra sensitive with the screw otherwise it will break? By this I mean more so than any watch in general. I appreciate it is a small spindle of metal, it will of course break if you miss treat it.
Thanks in advance.