This is a mid-1900s adding/subtracting machine that works like the La Pascaline of 1645.
I used it in my classes as I taught about early computing devices.
This is the only one of this model that I have although I have others in my TPT store.
THIS ONE HAS DAMAGE -- THE RE-SET DOES NOT WORK AND ONE CENTER PIECE SHOULD BE GLUED BACK.
If you are unhappy with it, I will gladly refund or replace it with another similar model, if still available.