Antique National Cash Register

I found this cash register in a old house that they were going to throw everything away.. I was curious if someone could tell me the value and I have research this register and found that it is either an 1895 or 1912 and they were used in the candy stores. The marble on the top was used to tap nickles on to determine if they were real. I would love to find out anything else about it. The great thing about this register is that it actually works..