This is a clock set of 1964 Jefferson nickels (1 is a no date off-center), with the off-centers all forming a complete "clock" of off-centers. The off-center strikes correspond to the "hours" of a clock. It is housed in a Capital Plastic black holder. There is a a little tape residue, which could probably be removed.
Scarce as a complete clock set of the same date, and also housed in a Capital Plastic holder.