The Pebble display isn't e-ink, or unique amongst watches, it's an off-the-shelf MIP LCD from Sharp.
You can get the same thing in watches from Garmin, Coros, Polar, Suunto, Casio and probably more.
I think you're confusing Pebble with something else. All current models on the website as well as the OG pebble (according to Wikipedia) use eink displays.
I think you're confusing Pebble with something else. All current models on the website as well as the OG pebble (according to Wikipedia) use eink displays.