Box of 12 Rhythm Ball Pencils (Pens !) Decorated with 1958 Calendar

There's a lot going on here.
A box of 12 "Rhythm" BALL PENCILS that are in fact pens.
Decorated with the calendar for 1958.
Which explains why the ink in the pens has all dried up...
But lovely packaging, perfect if you have a glut of friends who were born in 1958,
or if you collect artifacts from the pen/pencil transition.
They were made in Japan by the Tokyo Ball Pen  Co Ltd.