The shorts are modern. I definitely remember them and other Volcom items with similar prints just a few years ago.
They began in Montreal, Quebec in 59 here is the history and they are still in business... Code: https://en.wikipedia.org/wiki/Le_Ch%C3%A2teau Their Montreal shop actually had s a small section that offered vintage clothing for a brief time back in the late 1970s. I remember going to check out those racks quite frequently.
We used to call them 'Le Crapeau' in the early 80s because their stuff fell apart after a few wearings, or one cleaning!