Swiss company ETA SA, part of the Swatch group, made seven different automatic quartz movements, calling them Autoquartz. They were part of the premium Flatline series of movements and were sold to a variety of watch vendors, primarily European and American. High grade movements designed to last as long as their premium mechanical movements, they had between 15 and 53 jewels. Unlike most quartz watches, Autoquartz could be calibrated to increase their accuracy. Several vendors had their Autoquartz watches COSC certified. In 2006 to increase production of its highly demanded mechanical movements, Swatch discontinued supplying the Autoquartz line to customers (service and parts are still available). Then in 2009, possibly due to available production capacity or stocked parts, Tissot reintroduced the Autoquartz in its PRC200 dive watch. The Autoquartz movement used by Tissot is gold plated and carries the designation ETA 205.914. Movement calibers:204.901 (small 8.75 lignes used primarily in women's watches)204.911 (replacement for the 204.901 upgrading from a capacitor to a rechargeable battery)205.111 (discontinued and replaced by the 205.911 which upgraded from a capacitor to a rechargeable battery)205.711 (15 jeweled movement used only by Swatch Watch for a variety of its fashion watches)205.911 (the most commonly available movement having 17 jewels and often ordered in gold plating)205.914 (no information available from ETA)205.961 (a 205.911 with the addition of a GMT hand)206.211 (a 205.911 fitted with a Dubois Depraz 2021 to make a chronograph. With 53 jewels the most jeweled quartz movement ever made) Manufacturers who employ or employed ETA movements: Tissot, Rado in their Accustar line of watches, Longines, Swatch, Omega (Omega Seamaster Omega-matic), Dugena (K-Tech), Wenger (GST Field Terragraph Autoquartz), Hermès (Nomade), Roberge (Altaïr), Mido (Multifort), Bovet (Autoquartz calibre 11BQ01), Fortis (Spacematic Eco), Belair (Autoquartz), Franck Muller (Transamerica), HTO (Grand Voyager) and Cyma. Citizen Citizen, one of the world's largest watch manufacturers, also built an autoquartz-powered watch: the Eco-Drive Duo (released in December 1998). Novel to this watch was the use of both mechanical power as well as a solar cell. This model was an attempt to enter higher-priced markets (at a cost of around $1000 USD), but the technology failed to attract consumer interest and Citizen has since stopped making use of the unique movement. No other autoquartz powered watch from Citizen is known; all other Eco-Drive models only use solar power or thermal power. Ventura Ventura is a small Swiss watch manufacturer claiming to be "the