Two-fisted sailor Lance O’Casey duels with female pirate Singapore Sal, who also battled Don Winslow several times in Fawcett’s comic book based on Lt. Commander Frank V. Martinek’s comic strip Don Winslow of the Navy. Don Winslow and Lance O’Casey have both been linked to the CU and their encounters with Sal confirm their coexistence. Lance battled Sal again two issues later in a story entitled “The Stolen Starfish.”
This crossover, and many, many more, are covered in my book Crossovers Expanded: A Secret Chronology of the World Volume 3, which will be published by the fine folks at Meteor House! All three volumes are AUTHORIZED companions to Win Scott Eckert's Crossovers: A Secret Chronology of the World Volumes 1 and 2!