Hello,
A picture is worth a thousand words!
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I think you'll need to spend a little more time to see if the refrigeration works properly and if not, this will reduce the value a little due to a cost replacement.
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In general, the 6 Case Cooler hasn't retained a good value mainly due to the lack of coin operation vending and that the machine is slighly on the larger and heavier side as opposed to its smaller cousins, V-39, V-81, V-80, V-44, etc...
Without even seeing the machine, my guess at a value would be between $500 - $750 depending greatly on completeness, everything is functional, and condition!