This is a tool called a "pin pinner" (or pinning device). For insect specimens, etc.

Pinning Tool, Pin Pitter, Dedicated Case, Store Supplies, Price Supplies, Tagging Supplies, Insect Specimens
?? Pinning Tool
This is a pin tacker (pinning tool) for insect pins, developed for exhibition work in art museums and museums.
It is a convenient tacker for driving thin and short insect pins.
The structure drives pins with a pushing motion, minimizing vibration transfer to other works.
(Insect pins are not included.)
● Size: (approx.)
Total length 2cm, Weight 113g
● Condition
Operation unconfirmed, sold as-is.
There are dirt, scratches, and scuffs due to age.