1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Titanium and stainless steel 18K gold Oyster case with

18K gold Oyster case with fluted bezel

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

Gump’s and The City became intertwined—according to Gump's their large store became synonymous with San Francisco in its elegance

and IWC among others to build some of the beautiful examples of their early wristwatch cases

this watch is powered by the well-regarded caliber 3035 movement

1973 IWC Large Vintage Mens Caliber 150 Electronic Tuning Fork Watch - Stainless Steel Titanium and stainless steel 18K gold Oyster case withToday'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