Sub-Mariner 54 with “3 sub-sea sagas” as the cover proclaims. The finale for the Dragon-Lord story has Sunfire teaming up with Subby (and then battles him again:) Namorita battles Betty Dean (no really) and then falls for a young naval officer (literally) in this Bill Everett production.
The second saga is from Mike Friedrich and Alan Weiss in a nicely drawn story about mer-mutants.
Last is a reprint from the 50s by Bill Everett when he was at his artistic height (Sub-Mariner 39, April 1955). The story is from Namor’s youth when Namora taught him a lesson in humility.