On-sale date from Amazing Heroes #47, with shipping date of 1984-05-08.
This issue is a variant of Thor (Marvel, 1966 series) #347 [Direct].
There exist further variants:
Thor; Roger Willis; Odin; Heimdall; Balder; Agnar; Wyrd (a Norn); Warriors Three [Hogun; Fandral; Volstagg]; Malekith (villain); Lorelei (villain); Algrim the Strong (introduction, villain); Dark Elves (villain); Surtur (villain); Wormwood (villain)
Synopsis
Thor and Roger invade the realm of Faerie to rescue Thor's love while keeping the Casket of Ancient Winters out of Malekith's hands. They don't quite succeed. Balder has a chat with a Norn. Odin prepares for battle. Surtur prepares to invade Earth.