As we know that the principle of the Echo-Drive watch is absorbing any visible light and converting it into kinetic energy to drive the watch. So please unstand why i blacked the manufacturing No. If you don't know how to verify it please call the Citizen customer service hotline. Because the 'serial No.+ manufacturing No.' Is paired to one and only one wacth, so the correct way to distinguish if your watch is real or not is to verify it with the serial No. The serial number on fakes is generally the same, some people can distinguish the fake watch by the serial number. The engravings on the case back are different: the engravings on the fake are very rough, the real watch is laser finely engraved. Eco-Drive Archives - Citizen Watch - English (US). In 2011, CITIZEN first invented a unique satellite timekeeping technology,“Satellite Wave GPS”, which enables watches to receive time signals from GPS satellites and display precise time and date anywhere in the world.
