Hello! Unfortunately Whisky.com does not offer valuations at this time. However, we may be able to date your bottle of Dewar's - otherwise you will need to contact a company such as
www.mctears.com or
www.bonhams.com - both of these companies are auctioneers, and may be able to give you a value. Let me know if you want your bottle dated. Cheers! Jojo