This one-shot is undated. Dating is an estimate.
Brea's signature is covered on this printing of the cover. Other printings of this cover include: Escorpion (Vilmar, 1973 series) #67 (March 1983).
“Editorial Vilmar - Barcelona - The Illustrated”. The version of this story in Vampire Killers (Gredown, 1983 series) #nn (1983) is a different translation. Other printings of this story include: Escorpion (Vilmar, 1973 series) #66 (February 1983).
"©—Editorial Vilmar—Barcelona—The Illustrated". Although Carrasco is listed on script and Garcia on art, it seems likely it should be the other way around.