Calculated from data: contrast ratio of 8:1.. yeah, nope that's not right ^^
However you can see quickly why colors on this display look so strange: the blue channel is way off and clips at IRE 82.
It might be a deliberate attempt of the people who profiled the panel to make it appear colder blue than the white point really has.
As you can see on the RGB Levels graph, there is tha much deviation between channels. If you saw the watch display in real life: you probably knew already.
I don't know yet what is it that makes darker values brighter than they should: it might be a content adaptive brightness algorithm tuned for readability.
As seen on the CIE Diagram there might be some more color processing going on as well.
The small size of the display is compared to the size of the X-Rite i1 Display Pro is not making things easy, I'll try tuning my patterns and using the i1 Pro instead.
Well, you gotta start somewhere right?