These are Bally Brown Leather "Cincia" Sandals in size 40.5. Made in Italy, they have a cuban type heel mid height, slingback style (with elastic at back), smart styling suitable for smart or casual wear.  The uppers are leather, and I assume that the lining is leather too but can't verify that.  As they're pre loved, they show light wear to the soles, but other than that there is only minimal other wear.  When on they look as new condition.  Size 40.5 seems generally to be a UK size 6.5; the box shows a C mark which I imagine is a standard width. I've included a photo of the inside of the strap which shows Cincia 40.5 Made in Italy and the Bally label.

Incidentally they look very similar to current Bally sandals retailing at around £550!