Not sure if wheel is original.... The spokes been re-worked for sure. The "coin" entries have been shimmed. A nickel will not fit... (but with shims removed they may work) This is one machine I'm not very familiar with other than it is somewhat rare.
They do show up from time to time though. The item "Mill Check Boy Slot Machine / Trade Stimulator" is in sale since Friday, October 28, 2016.
This item is in the category "Collectibles\Casino\Slots\Machines\Antique Coin Slot Machines". The seller is "chriscoinop" and is located in Houston, Texas.This item can be shipped to United States.