IRON MAN (1968) #73, [Fine/VF (7.0)]

Iron Man returns to Vietnam to search for Roxanne Gilbert and Eddie March's brother, Marty March. The two missing Americans have been captured and are being held in a high-tech cavern in the Central Highlands. Before Iron Man can rescue the hostages, he must defeat the vengeful Crimson Dynamo (aka Alex Niven)! Also, Stark Industries officially changes its name to Stark International.