Vintage Shipman Mfg Postage Stamps Vending Machine Porcelain No Key

Got this from a guy who bought this at a gun show 25 years ago. I don't know much about this. I'm not sure if it's in working condition. There is no key for it. The three levers do pull down.

Looks like there's some stamps in the icon as visible in photos. Let me know if you have any questions.