Help with dating dress

[Rowena Reeday]

hiya,
I have a dress and don't know if it's 1960's or 70's.
metal zipper
Nylon. Mini dress.
DL Barron made in London
Thank you very much. I'm just learning about all this.

 

[Jonathan]

Looks 60s to me - 66/67 when those psychedlic swirl prints were big.