Those straps seem to be of a later design - the Cinelli buttons are definitely so.

If you want Bindas, these are more period-correct:

NOS Alfredo Binda Bianchi Dino Leather Toe Straps Made In Italy | eBay

Are you looking for a particular color? Because I may have one or two NOS sets of PC Binda straps here. I'll look. And I wouldn't charge stupid Ebay prices ($80 for a pair of toe straps? WTF...).

DD