Guess the Zoomed Object: May 18-22, 2020

Can you guess what this object is from only a close up picture of it?

Hint: The “Hello Girls” used this.

This zoomed picture is from a switchboard. Hello Girls (the ladies who operated these machines) would sit in front of the telephone switchboard with a set of headphones on and when a call came through, they would answer and connect one of the cords to the appropriate call number.