There were three printings of Superman #1 in 1939:
First printing - 500,000 copies
Second printing - 250,000 copies
Third printing - 150,000 copies
All printings have an advertisement on page 32 for Action Comics #14
The advertisement in copies of the first printing states an on-sale date of Action Comics #14 as June 2nd
The second and third printings of Superman #1 are indistinguishable from one another but differ from the first printing with ad copy that states "Now on Sale"
CGC does not differentiate the printings on the label but as of 2024 distinguishes between the two in the grader's notes
