1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Titanium and stainless steel retro steel baton indices topped

retro steel baton indices topped with black

Case markings (outside): Waterproof with hypocampus logo

Its case and movement are in a condition you just can't find anymore

Its case presents as mint with nice thick lugs that have not been overly polished

this model features a manually wound movement

1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Titanium and stainless steel retro steel baton indices toppedToday'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