Found a cute hand tool in a shed. Reverse image search suggests it's a riveting gun. One side says "Intern(i)et W. Germany", the other says "NZ-3". I'm not usually into riveting, however the name, "Internet" (or perhaps "Interniet"?), is intriguing and funny.
Does anyone have some context on the tool or the company that made it? Is it named Internet or Interniet? Why this name?
Photos (see my gallery on Google Drive for more: https://drive.google.com/drive/folders/1-RViCp2E-ZEISgmGOOOtA6TBc-gEKmxd?usp=sharing):


