ZSL Whipsnade Zoo cap

I would say they are 1970s, partly from the look but also because I have a guide book from 1982 where Whipsnade is referred to as Whipsnade Park, and then subsequently as Whipsnade Wild Animal Park through the 80's and 90's. This cap must predate that time.

@Ned Thank you so much, my grandparents were trying to remember when they brought them but could not remember so this helps them out a lot