This is a LetterBox Hybrid Geocache
Letterbox Hybrid geocaches developed as an alternative to the traditional cache. It combined the written clues guiding the geocacher to the container for those who want to do that, as well as the coordinates for those who just want to go after the container without the clues. Letterbox Hybrid's also include a stamp in the fashion of a traditional letterbox that is not to be removed from the cache.