Over more than 50 years, he encouraged many young collectors to remain in the hobby.
For some young collectors, the child has been father to the man.
What made Jack's card the envy of every other young collector was the name on it.
Such a collection could be put together at relatively low cost and lead young collectors, especially, to learn more about the civil rights leader.
It is also an area still open to young collectors.
I am certain they did this for many other young collectors.
That sense of wonder is something all young collectors share.
For many young collectors, hero worship plays an important role.
"I'm a young collector in an old person's field," he points out.
So what should young collectors look for if investing is their goal?