What is the oldest candy machine?

I'm curious, what exactly is the oldest candy machine that exists today? Is it a relic from the early days of vending machines, or perhaps a more modern invention that has stood the test of time? I'm eager to learn about its history, its design, and any notable features that set it apart from other candy vending machines. Additionally, I'm wondering if it's still operational, and if so, where can one find it to experience its charm firsthand?