The following text comes from the fellow from whom I purchased this:
This is a extremely rare find! I was quite excited to find it. The name "American Cash Register Company" existed during the time that cash register companies were actually ruthless in their competitive sales tactics. Salesmen would stand outside of a competitors store and wait for a customer to come out. Then they would talk down the product that was for sale inside the store, make reference that the company was infringing on patent rights, and talk of warranties that were not existent. Anything to persuade them to buy their product instead. This happened in the late 1800's and was a race to develop cash counters (Register) in the form of nice looking user friendly machinery that was cost effective to the merchant. The "Pocket Cash Register" is an example of a product that was not exactly user friendly and did not have a place for the cash to be placed.
The user would advance the pennies to ten cents to dollars to ten dollars to hundred dollars with the finger dials on the reverse.