Used Birkenstock Boston - dark Grey/black size 39

Used but good condition Boston from Birkenstock. I can’t tell if these are dark grey or black, so leaving it up to you to decide. Honestly it depends on which way you brush the leather surface. There are some little oil drops on the top. You can’t see them if you’re looking down at your feet, but I’ve tried to photograph them as accurately as possible. Please check out the photos in detail. These are used, without box. Size 39 regular (not narrow). I use recycled packaging whenever possible.