This issue is a variant of The Avengers (Marvel, 1963 series) #236 [Direct Edition]. There exist further variants.
Letters on The Avengers #231; Question of the Month "What do you do in your spare time?" asked to Stern, Milgrom, Sinnott, Chiang, Gafford, Carlin, Gruenwald and Shooter; Special Announcements Section. Letters from Bill Ward Jr., J. W. Litch, Ricky Nelson, Jeff Jacobs, Joe Ferraro