This topic may have been discussed already, but I couldn't find it.
As best as I can tell the historic spelling of whisky in Ireland is without the e. Even Dublin's big four spelled it without the e when Truths About Whisky was published in 1879. By the early 1900s they all seem to have shifted to whiskey. I have read that this was a decision taken to differentiate Dublin Whiskey from 'the rest.' However, I have seen some very old adverts from Bushmills that tend to indicate that it adopted the e quite early, but Bushmills seems like it may have been an exception along with the Glen distillery in Co. Cork.
As best as I can tell all in this list are pre-1950s.
Whisky:
Coleraine
Allman's
All Belfast Brands
Cork Distilleries
Persse's
Watts brands (Londonderry)
Whiskey:
John Jameson
John Powers
George Roe
William Jameson
Cassidy's (Monasterevin)
Bushmills
Old Comber
Tullamore
Can anyone shed any light on this mystery?
Once I have won the lottery and open my distillery I shall call it whisky. Then I can say it is the only true Irish whisky.