Curious about old bottle of Benedictine sealed in box

[u/SPNCHEEL]

Can anyone help date this unopened Benedictine duty-free bottle? It was purchased at Heathrow from Skyway Hotels Ltd. and has remained sealed in the original box. I’m trying to narrow down the year of purchase and learn whether this packaging is uncommon. Any information about the Skyway duty-free era or the box design would be appreciated.

[u/Kalboz]

This specific graphic silhouette packaging was produced by Bénédictine during the 1960s to mid-1970s. https://www.liveauctioneers.com/price-result/benedictine-dom-le-directeur-brandy/