Francis, as you're already aware, our contact at Diageo tells us that by comparing the photographs you provided to items held in their historic packaging collection, they were able to date your bottle. The letters EC preceding the serial number were printed on export bottles between October 1963 - December 1966.
As for a valuation, contact any of these companies: Mctears.com, Bonhams.com and / onlinebbr.com
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Jojo 
Whisky.com
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