HWA Northern highland malt 1977 20y / miniature

Holland Whisky Association
probably rebottled from standard 70cl bottles into 5cl miniatures by HP de Vreng, Amsterdam

Northern Highland Malt 
distilled: 1977, bottled 1992, 20y old, 40%
wb158206, standard 70cl bottle: not a clue

Yes, the math is not correct. I think 1977 should be 1972