Large Advertising Token(Liberty Penny)

I have four of these large advertising tokens. They measure almost three inches across, are solid brass, weigh six ounces, and say“Liberty Penny” on them.
I cleaned one up a little to bring out some of the detail.
Around the bottom of the obverse are various thing, like a telephone, a plow, a light bulb, an airplane, a submarine, paddle wheel boat, a telephone pole and wires, and something that appears to be a skull on top of a book.
This was a company that my Grandfather owned back in the 1930's.