1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Constellation Our Master Watchmaker has performed

Our Master Watchmaker has performed any needed servicing and installed a new battery

It is all-original down to the original crystal gasket and presents as a 9

blackened and whitened steel batons with blue seconds

When you're wearing it it feels as light as a steel dress watch

Country of origin: Switzerland / France

1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Constellation Our Master Watchmaker has performedToday's offering features this very cool and rare IWC caliber 150 watch. For the movement the company used a patented tuning fork based movement made by ESA. These watches use a battery driven tuning fork whose vibrations are converted by a special index mechanism into an almost smoothless rotary motion of the hands. At the time, tuning fork watches were the most accurate timekeeping mechanisms ever devised. The tuning fork technology was so accurate