super strong box details welcome

[stephane]

hi gentlemen. read with interest all your post on vault doors, superstrong safes and beautiful locks so just hope i am not on the wrong way with my last found on a local brocante with this tiny (can not contain more than a cigarettes box) and strong for the size (3mm tickness) this charmante petite box. no idea and no marking except the "13" on the keys. the threading screws is inch so english or US one for sure.
this is a first lock when "clap" the lid and possibility to solid lock by one turn on the left. endless turn on the right (to lock off the clap and the hard lock)
i am sceptic on the original use of it because not understanding on something so little and strong, this is a no sense......and all the charm.
13cms length x 9cms large x 6cms high