Does your bottle have a metal spring cap or cork? During 1927, Dewar's started using a metal 'spring cap' instead of a cork to seal the bottle. Spring caps were then replace by modern screw caps during the late 1950s and early 1960s. Whisky.com does not provide valuations at this time, however, you can be helped by either Bonhams.com or McTears.com in determining the value of your bottle.
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Jojo 
Whisky.com
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