Hello,
A picture is worth a thousand words and since nobody can see the machine, I'll give my 6 cents...
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If it's complete as you state and refrigeration and coin mech are functioning properly, I would put the 42T between $650 - $850 in average condition. How bad the rust is could put it on the low end of the scale; however, if its just surface rust as you mentioned, this shouldn't be much of a factor.
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