This issue is a variant of The Avengers (Marvel, 1963 series) #189 [Direct Edition]. There exist further variants.
Direct Edition of this issue was actually printed with a barcode that was marked with a black slash from the printer/publisher. Direct Edition also distinguishable by the black diamond box around the pricing on the upper left corner of the cover.
Takes place after Avengers Annual (Marvel, 1967 series) #9.