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Ah, now those earlier push-to-set date movements are slightly different. I worked on an Omega Cal 752 which has the same type of date setting.
I can’t find a diagram of how the keyless works look for that movement, but in general, lack of “positive action” between the crown positions is usually down to a faulty “set lever spring” aka “bolt spring” aka lots of other names.....
On the attached diagram it is the “detent spring”. It is only accessible underneath the dial.
Not all keyless works are the same, but this is the most common design. On around 50% of second hand English-made Smiths, this spring is snapped!
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rodabod
pdlouche
Was browsing/researching parts and remembered about grandad's Montine. I believe it's the same AS1913 someone else has online. It has the button push style crown for date set, but it is kind of loose, no strong click between wind and set, and no strong push/return on the date change.
I remember you said bolt/bolt spring when I forgot the name a few months ago. Would it definitely be this and not the set lever spring (or are they synonymous?) Also something about needing hands/dial off to do the repair.
It's bothering me a little.