National Cash Register

I know very little about this cash register. It does say it is a national cash register made in Dayton, Ohio and I do know the serial number is 4848022. I have spent alot of time trying to find one that looks anything like this and have had no luck. It has a plug in so I know its not as nice or old. I know the bottom part and drawer is original because the serial number and model number match on both the bottom of the drawer and the front of the register. I kinda think the top part is not original, but i really have no idea. It does turn on and works good enough to open the door. Any information would be greatly appreciated.