An amazing English Art Deco chrome cocktail or Martini shaker. Streamlined design, this barware piece has a puffy shape and a rotating locking handle. 
This is a typical yacht cocktail shaker, allowing the bartender to shake the drink with one hand during storm situations on a boat when you need your other hand to hold on. After shaking your cocktail well, you just unlock the handle and pour your drink. There is no visible maker's mark.