Thanks for the advice Mark.
Pushers operate the chrono functions mechanically, very small levers on the side of the movement, should be contacted by the pusher when pressed.
The bottom pusher isn't doing the business. Understand your comments that dirt maybe inhibiting the pushers full extension - it maybe a fraction off but it does appear, to me at least, both pushers do move the same distance. Not even going to attempt to remove them. That'll be left to someone who knows what they're doing.
I did notice something that mabe relevant though, the movement is centered exactly on the dial, just a very small amount, but could be enough, with an iffy pusher to cause the problem.
The dial with the chapter ring sits perfectly, with no play, within the case...could be the issue?
Off to a local watch dealer next week who's done work for me before to see what's going on.
Meanwhile, with a quick tickle (needs more work) with some fine Garyflex to knock back the worst of the marks and chrono hands zeroed it's a presentable and wearable little watch :)
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