Another thing from the past.. Used to wear them in and around office and no, I don't walk around town in these 4 heels. Since Nina Ricci is a French designer house, the heels are less suited for wide feet.
The heels measured from the centre of the back heel VERTICALLY down (not along the heel) is 4.25. Inside front part has hidden platform, about 0.75.
Inside length is about 9-9.25 (23-23.5 cm).