This is an advertising token -- AKA a Flipping Coin.
It is not from 1782 -- that's not the date, but rather part of the phone number to the restaurant ('Delaware 7-1782'). I would estimate its age at about 50 years.
It's from a Chicago restaurant, located at 420 N. Dearborn St. -- don't know if it still exists but probably not. It's known as a flipping coin because of the head of a pig on one side and the rear end of a pig on the other side.
It's value is about $5.00