craftgrrl | Please help me date a pattern

I'm hoping someone here could date a pattern for me. I recently purchased a whole stack of patterns from 1959 to 1991, and while most of them are dated, this one isn't.

(beloved boyfriend looking rather unimpressed to my right)

It's a Butterick pattern, #3157; female lingerie (a nightie) and bloomers. It's Australian, given the address on the back, and it's pre-1966 as it's priced in pounds and shillings.

This is a little obscure, and most Google searches direct me to the wrong patterns, but perhaps someone here may be able to guess an approximate date?

If there's a more appropriate community for this, please direct me.