Very good job on this. What is truly amazing when you take all this data gathered from those pics into account, is that the Chinese can make such a good watch for end retail price of just over £400. I’m wearing mine as my daily driver.
I wound the watch up after having it a couple of days and since then the 15 sec a day variance has gone and it’s now +-2s a day.
If I could find the parts I would change the insert, get it polished to factory, maybe the crystal. Only after having it a couple of years though.
What I have found out after wearing it is, no one cares
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I have a similar priced seiko diver and the VSF feels better in all areas. Which is a tribute to the work that’s put in I guess, even if it is only done to ape an existing brand.