I wonder what is viewable screen size in sq. mm. of different Pebble watches. I suspect they compromised on screen size a lot on this model and make it look big

I wonder what is viewable screen size in sq. mm. of different Pebble watches. I suspect they compromised on screen size a lot on this model and make it look bigger via wide bezel. Anybody have real data? It also would be good to see a side-by-side picture of Time and Time Round.