Circa 1970s.
Easily one of my favourite finds of all time!
This miniature "mug" is perfect for whatever secret use you can think up for it! ;) 
It can double as an ashtray, hold your beads while you craft, and so much more.
 
The front reads "Goodnight," and the back "keep me clean, use me well, what I see I'll never tell." There is also an eye inside, and a little floral decal on the outer side.
 
Dimensions:
Height - 1.25"
Width - 3"
Depth - 3"