VTG Mr Bartendar Products Stainless Steel Twisted Stirring Spoon Barware Japan.

Vintage bar spoon, a specialized tool used in bartending for mixing cocktails. It is made of stainless steel with a long, twisted handle.  
Primarily used for stirring cocktails, ensuring ingredients are mixed without over-dilution. 

While a regular spoon can be used, a bar spoon's length and design are optimized for mixing drinks in tall glasses. 

Bar spoons evolved from "sucket spoons" in the 1800s, used for stirring drinks and eating fruit garnishes.