This is a vintage kit from Astor Place, Ltd from 1979 to make a violet keyring.
It is new in package and is cross stitched on plastic canvas.
Kit includes plastic canvas, persian yarn, needle, cutting and stitching directions and a 1 1/2" key ring.
The square piece will measure between 3" and 4" square.
This is just a guess as it is not stated on the package.