These are almost identical to M122-28 Mitchell`s “Clan Tartans” apart from the facts that
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there are 25 cards in this set but 50 in the Mitchell
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that the Mitchell set has its name in the front top panel whereas the Grant is just a thin panel infilled in grey
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that the bottom of the reverse says “COMMISSIONED BY / WILLIAM GRANT & SONS LTD / PRINTED IN THE U.K. BY IMPERIAL PUBLISHING LTD / © 1991. FIRST ISSUED IN 1927”. (The 1927, of course, being the date of the Mitchell set.)
Now this set was not issued one card at a time with a bottle of whisky, as you might imagine, it is said to have come as a complete set in a box. However the “box” can be seen at the Scotiana website and I would probably call it more of a “wallet” than a box, especially as the thickness of just twenty five cards is not great.
However it does provide us with a great piece of information as the box or wallet advertises the Glenfiddich brand, and they actually had a range of bottles featuring clans, though they were issued earlier than this. They also sold their expensive drinks in tins, so it is possible that these cards were either included in special tins, or you had to send tokens or seals to get a complete set.
If there is anyone out there who remembers acquiring these cards, at the time of issue, and can add any more info, please do get in touch.