I too remember getting interested in butterflies and moths (during the late 1960's) due to a similar collection held by a man who used to live across the road to me. In the days before digital cameras, getting the chance to see set specimens seemed the only real way to discover how beautiful they really were. Fortunately things have changed now, but it did give me a lifelong interest in insects of all kinds. I spent much of the next couple of years popping over the road with a new-found insect for him to identify and must have really got on his nerves. He gave me various books, one of which he inscribed "to a budding entomoligist" and they really fired my enthusiasm.
We also used to go looking for Privet hawk moth caterpillars on the bushes on our estate in Cambridge and the knack of finding "the squishiest black barrel under the bush" (their faeces) and looking directly above that on a privet bush to discover the caterpillar something I am still quite good at today

Thanks for posting the pic - it really takes me back to those innocent days of youth.
Trev