Birkenstock sandals genuine leather size 38 L7 M5 black made in Germany

Birkenstock sandals genuine leather size 38 L7 M5 black made in Germany pre-owned lightly worn condition. please note blue scuff on buckle an image, slight toe marks and glue on left heel. leather still looks brand new and is super strong and stable. no visible signs of wear when worn, other than that blue stuff. not sure what it is, has been on there the entire time I own them. I probably wore them 10 times.