Excellent condition, lightly used Birkenstock Madrid sandals.  The only markings on the sandals are the light staining on the bottom of the soles (due to them being white).  See photos for details!!  Per Birkenstock;

The original BIRKENSTOCK Sandal. A strap, a buckle, and a contoured cork footbed are masterfully combined to create the Madrid. The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor®.