Exceptional Chronometre Extra wristwatch - Art Deco - Tank in a massive 48 mm design. The watch dates back to the 30s and was intended for the South American markets. Chronometre EXTRA were produced by various Swiss houses as exclusive series for specific markets that required a combination of chronometric precision and design. Gold-plated case 20 microns (Plaque or lamine 20 microns) in the design of a two-piece folding case of the "Cabriolet" type. Precise round manual Chronometre extra movement with 15 jewels. The watch is in original period condition and fully functional. Beautiful collectible and exceptional piece of history.