Peter Parker wrote:
That goes back to what I said that I believe the issues dated June '79 and forward (not May as I previously said) were actually the first Direct Edition variants, as there is no issue that does not have a variant designated.    
Oops, I noticed there are a few June '79 issues omitted (Marvel Two-In-One, Shogun Warriors, and Spider-Woman).  Sorry about that, but I believe the DM was just getting underway with these months.