Casio's PRO TEK WSD-F30 is an Android Wear OS based smartwatch that sports a round 1.2" round 390x390 AMOLED display with a monochrome transparent LCD on top that can be used to conserve battery life (up to a month with wireless off). It features a MIL-STSD-810 certification, GPS, Bluetooth and Wi-Fi.

The WSD-F30 is now shipping globally for $549 (note: affiliate link to Amazon).

OLED type: 

1.2" round 390x390 AMOLED

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs