But how much? Or what is the cut off?Yes, absolutely. As I said, the movement isn't the only thing that adds value in a watch. Design, finishing, additional improvements and even history all play a role.
Now whether any of that matters to you is a personal decision.
But I don't see a big difference, as far as economic justification goes, in terms of paying $5000 for a watch with an ETA movement, vs $7,000-10,000 for a similar watch with an in-house variant of the same movement.
If one doesn't make sense in terms of value, neither does the other. And that becomes a personal decision.
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There gets to a point that the simpler things like case work becomes closer to equal as costs increase. And for myself I apply a semi unconscious 'degree of difficulty' analysis to my comparison. Different brushing between brands can come down to a style choice by the designer but there may be no more or less effort put in. But when you throw a movement that's a stock, even Chronometer, 2892 or SW300 vs say an 899/1, well there's no contest for me, especially at a close price. One may have put the effort to make (or select most likely) excellent components, but they fundamentally took a shortcut on their movement choice. If they can't make the movement, why should their inability to match the effort and expertise that JLC put in be rewarded with a similar price?