Vintage wine appraisal

Anyone know who/where I can get an appraisal on a vintage bottle of wine? Specifically an El Monasterio from the Manuel Fernandez in Spain.  It was a limited run--each bottle was numbered.  Its a cream sherry, never opened with tax stamp still in place. Roughly a 1972...
Any ideas are appreciated
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Good point - something is only worth what someone is willing to pay for it - not what someone says someone should.
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