Dating vintage YSL wedge heels

[Alex Flanders]

Hi!
I’m having trouble finding a definitive date for these patent leather wedges by Yves Saint Laurent. I have seen shops online with the same shoes saying both 90s and 70s.
Does anybody happen to know/possibly have more tips for dating these?
thanks!!

 

[Jonathan]

Late 70s - 77-78

 

[Alex Flanders]

Late 70s - 77-78

Thank you!