While this is certainly not an official valuation - we hear it will be less than £100 (which is less than approx $168 USD). Also, really not clear on the date. The "68" you see on the tax stamp is the federal number of the importer and doesn't relate to date. (not sure if you thought this might have been the date). For an official valuation, contact mctears.com or bonhams.com Please keep us posted on your findings.