This is Koh-I-Noor 5.6mm Mechanical Metal Clutch Leadholder with Built-in Sharpener 5340 : Silver
This is a mechanical pencil, metal without a clip. it is used for common writing and drawing with lead of 5,6 mm in diameter.
The lead is moved by pressing the sharpener knob in leaned pencil position, which opens the clamp and the lead slides out. The lead can be sharpened and the sharpener is located in the knob that is to be screwed out.
The pencil is in an octagonal envelope profile 0K12, sprayed with silver color.