This is a copy of Shazam #12 published by DC Comics in 1974. 
 
Three new stories: "The Golden Plague!" Script by E. Nelson Bridwell, art by Bob Oksner. Captain Marvel Jr. stars in "The Longest Block in the World!" Script by Elliot Maggin, art by Dick Giordano. Captain Marvel stars in "Mighty Master of the Martial Arts!" Script by Maggin, pencils by Oksner, inks by Vince Colletta.
 
Reprints: "Mary Marvel Versus Nightowl" (from Mary Marvel 24 in 1948), "Uncle Marvel's Wedding" (from Captain Marvel Adventures 59 in 1946), and a five-part story, "The Sivana Family Strikes at the Marvel Family" (from Marvel Family 10 in 1947).