Dealers, graders, historians – whoever is grading the coin will have an opinion that is likely to differ from another’s. This is not to say anyone one appraisal is more valid than another, or that one opinion is correct while any others are incorrect.
Some officials may factor scarcity into a coin’s valuation more heavily than condition, or vice versa. It is unlikely that experts will produce vastly different valuations, but we suggest you consult more than one to get a good idea of your coin’s worth.