Thor (1962 1st Series Previously Journey Into Mystery) #458

With the true Thor residing in Asgard and engaged to Sif, Eric returns to earth as Thor to continue his heroic exploits; Eric encounters Shatterfist and is plagued by the thought that now he can be killed (he met the villain in the future circa Thor #440 and learned that he would not die until after he met his foe in the present); Eric goes to the Avengers for advice; He meets Sif at the Mansion and she professes her love for him but he does not know that she is really the Enchantress in disguise; Amora sends Eric to Asgard to "rescue' the real Sif from Thor; Thor and Eric battle.

Tales of Asgard  backup; Odin goes to the dwarves and has them make a new weapon for Eric.

Cover is an homage to the cover of Thor (Marvel, 1966 series) #126