7.2 Are there any specific features or symbols that are unique to Bally slot machines?.7.1 How much can I expect to pay for a vintage Bally slot machine?.6 Collecting and Restoring Bally Slot Machines.5.2 What to look for when inspecting a Bally machine for authenticity.5.1 How to avoid counterfeit or replica Bally machines.5 Tips for Authenticating Bally Slot Machines.4 Researching Bally Models and Variations.3.2 What serial numbers can tell you about a machine’s age and production run.3.1 How to locate serial numbers on Bally machines.2 Understanding Bally’s Design Features.