^ 'Celebrating 30 Years Of Environmentally-Conscious Watch Making -'.Archived from the original on 18 July 2014. In March 2019 three limited edition wrist watche models with the Caliber 0100 movement were announced to become available for sale with deliveries expected around the 2019 fall. The Caliber 0100 movement in 2018 was not available for sale to the public, the technology inside the movement will be introduced in future models. As a result, errors caused by spatial orientation and positioning become less of a concern. Besides that AT-cut variations allow for greater temperature tolerances, specifically in the range of −40 to 125 ☌ (−40 to 257 ☏), they exhibit reduced deviations caused by gravitational orientation changes. Key elements to obtain the high claimed accuracy are applying a for a watch unusual shaped (AT-cut) quartz crystal operated at 2 23 or 8 388 608 Hz frequency and thermal compensation.
In 2018 Citizen announced it developed the Caliber 0100 Eco-Drive prototype autonomous high-accuracy quartz watch movement which is claimed to be accurate to ± 1 second per year. This watch features a ring-shaped solar cell surrounding the watch case sidewall. In 2012 Citizen announced the Eco-Drive RING Concept Model. This makes radio-controlled timing possible in remote areas that are not serviced by land based radio time signal stations. The Concept Model 2011 was the Eco-Drive SATELLITE WAVE that has a movement that can receive time synchronization signals from GPS satellites. These Eco-Drive Concept Models are generally shown at exhibitions and produced in limited editions. Since 2009, Citizen has developed Eco-Drive Concept Models as technology demonstration and marketing tools.
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