Amazing Spider-Man (1963 1st Series) #211 CGC 8.0

"The Spider and Sea-Scourge!" Guest-starring the Sub-Mariner. Script by Denny O'Neil. Pencils by John Romita Jr. Inks by Jim Mooney. Cover by John Romita Jr. and Al Milgrom.

As a favor to Debra Whitman, the web-slinger accompanies her uncle's cargo ship on a perilous Atlantic Ocean voyage! Why is the trip dangerous? Because of past hostilities between the shipping company and the Avenging Son! Wait a minute, does the wall-crawler know this? So much for good intentions, it's time to get ready for a battle on the high seas! The Amazing Spider-Man vs. the Sub-Mariner! 

32 pages. Cover price $0.50.