Issues sold on military bases may contain an insert with ads for Police Officer Training, National Diamond Sales and California Gift Center.
Cover pencil credit confirmed by Bill Richardson (February 6, 2008) based on the signed original art and confirmed by John Romita. Nick Caputo, via the GCD Error Tracker (Error 2918), suggests the Sal Buscema pencils credit on the basis of the Spider-Man figure.
from The Amazing Spider-Man (Marvel, 1963 series) #51 (August 1967)