Gum machine ID and parts

[b0Bs]

Hello my name is Bob and this is my first post so please excuse me if I’m in the wrong area.
My son who was in college at the time found this gum vending machine in a dumpster on move out day and bought it home to restore. That was 10 years ago. Can anyone lead me in the right direction as to who manufactured these and where I can buy parts. The left plastic viewing window is broken and we don’t have keys. Any help would be greatly appreciated