Your tins look to me to be no earlier than the 1980s with the "Made in the United Kingdom" printed on the paper labels.
The smallest tins available at the time (in the UK) were 25g - this trio of "Made in the United Kingdom" were bought in the early 1980s
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Before, during and up till near the end of the 1970s the print read
"Blended by Alfred Dunhill" and I well remember the blending bar in their flagship store in Jermyn Street.
There was also a large book on the counter which contained the favoured blends of countless generations of pipe smokers
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From the late 1970s the print read
"Made in England" at which time the blending was done by Robert McConnell (also then responsible for Davidoff blends - according to the paper discs inside the tins)
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From the early 1980s the print read
"Made in the United Kingdom" or
"Made in Great Britain" at which point production switched to the Murrays factory
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By the mid 1990s the royal warrant had gone and the long-winded print read
"Made in the UK in association with Dunhill Tobacco of London"
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Anyway, enough of that, your tins will without a doubt give you the smokes of your life (at least going by my experience with Dunhill tins of similar vintage as these Dunhill blends only improve with age unlike some others brands from the period that I've popped in the past ten years which are but shadows of their former selves).