Womens arizona black Birkenstock 37 narrow

Selling a pair of black womens Birkenstock size 7 narrow . The box says womens US 6 . Not sure what that means but they fit my 7.5 foot . No wear on the bottom but i must have spilled something on the footbed because both footbeds are soiled . Funny bc i never wore these out of the house . Arizona 37 narrow fit Black leather