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davidcyclebackA black light is useful for identifying these types of reprints. The Fro Joy reprints I recently looked at fluoresced brightly under a black light.
http://cycleback.com/photoguide/fourteen.htm
My opinion is that collectors should be unusually careful in purchasing Fro Joy Ruths. People shouldn't be purchasing them from anyone off the street. Personally, I would never state that a Fro Joy was genuine without looking at it under the microscope.