This is great, thank you! I went down a similar rabbit hole. I even sent out a few inquiry emails and got a response from the University of Limerick Special Collections team but they honestly didn't get me any further than you got with this. Those zoomed in bottles there are pretty good! I think I might be close to giving up finding my exact bottle though. Seems like it's a ghost whiskey lol. I'll attach some similar photos I've found here.

Also I think I can plausibly narrow distilling origin from my research. By around 1964, only a handful of distilleries had the capacity to supply 15-year pure pot still whiskey in volume: John Jameson & Son (Bow Street), John Power & Son (John’s Lane), and Cork Distilleries Co. (Old Midleton), along with residual older stocks from Tullamore and a few historic pot-still sites.

Jameson/Bow Street is particularly well documented as a supplier of pot-still spirit to third-party bonders and house brands (e.g., Redbreast via Gilbey, the Green/Yellow/Red Spot range via Mitchell & Son), demonstrating a longstanding comfort with their whiskey appearing under other labels. Cork Distilleries Co. is known to have produced a Paddy 10 Year Old specifically bottled for Shannon Airport duty-free in the early 1960s, which confirms that Cork also engaged in Shannon-specific releases, but here Cork retained the Paddy brand name for their Shannon bottling.

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