The scarce first appearance of Ditko's Captain Atom is calling down serious heat,
You can see here that Space Adventures #33 is on fire:
A copy in somewhere around GD condition sold for $300, and a best offer was accepted for one listed for just under $1000.
One graded CBCS 4.5 has 5 days left, but already has bids totaling over $360.
Captain Atom is Steve Ditko's first superhero - it is not easy to find and darn expensive when you do. Values should be checked.