It's a vintage (& original) daybill movie poster from 1968.
The Australian daybill is the Aussie equivalent to the US insert and measures approximately 13" x 30" and was issued with 3 folds.
I've not seen one of these... possibly produced in Australia using a stone lithograph.
Quite a few stain marks from spillage, but otherwise in pretty good condition.
The standard Barbarella movie poster looks like this:
This type of poster is called a US R77. It measures 24 x 47.
It also has triple folds (as they all did back then).
It's condition is better than my Aussie Daybill though I quite like the look on Jane Fonda's face in the 68 Ausie Litho.
Watching movies like this, Dr Who,Star Trek and Lost in Space were I guess responsible for introducing me to those electronic sounds I love so much today.
Guess I never grew up.
Below is a video taken of my beloved serge making some sci-fi noises.
And I couldn't resist placing this link:
Barbarella vs the "Excessive Machine" making her own brand of noises. :-)