Error, Playschool Alphabet Bell--missing letter '0'

MAJOR ERROR...Alphabet has no letter "O"!!

This was put out by Playschool in the late '60's. I remember my son excited to show me that he has learned to say the alphabet. ABCDEFGHIJKLMNPQ...when he skipped the 'O', I stopped him and corrected him. But, Daddy, look here..." and he showed me the bell I had given him. Imagine his confusion.

This Bell is over 50 years old but show hardly any wear. This is a fantastic conversation piece and quite a rarity. Playschool specialized in learning toys but they dropped the ball on this one.