Mint Condition! Brand new, but no tags. never worn. size 40 Eu size 9 Aus. Midnight blue suede leather upper. 

from the website: 

Simple yet sophisticated! The Birkenstock Montana is a fully enclosed shoe, based on the classic Birkenstock footbed. This style features absolutely no stitching thanks to its special construction. The two upper sections are held together by two rivets and the novel lacing pattern. Popular for those that value uniqueness whether it's for work or leisure.