For Sale: Omega Constellation 300Hz Tuning Fork Watch is in good condition. working as need. Comes with Leather Case little learning (from web): The tuning fork watch is like no other battery driven watch, or mechanical for that matter: it is driven by a tuning fork vibrating at 300-720 times a second, depending on the model; as a result, it doesn't tick, but hummms. The index mechanism also means the tuning fork watches are characterised by a constant sweeping seconds hand. This movement is licensed by ESA to Bulova. Omega as a caliber 1250, the base movement is an ESA (Ebauches S.A) 9162 found in several other watches from Baume et Mercier, Eterna (1550), Cerina (29-151), IWC (150), Longines (6312), Tissot (2010), Zenith (50.0) etc. all parts on watch are genuine, crown, glass, backcase. strap is replacement. Dial is in nice condition, silver tone. size of case is apx 35.5 w/o crown and lugs are apx 19mm. there are normal signs of use on it. Price: $620 paypal (FF or G&S +4%), shipment included in price, worldwide (from usa)