"The third" is actually the true first printing, with no banner in the upper left corner, and the heavy card stock cover. "one dollar" cover price
There are also two issues that have a banner saying "premier issue" in the upper left corner, one of which has "Summer 74" just under the title.
Both were also sold at a cover price of "one dollar"
Those are both second printings released shortly after the first but in a much larger run. I've heard one was for the USA, and the other Canada
The fourth printing(actually a reprint) came out a couple years later along with reprints of issues 2 and 3.
You can always tell a reprint by two things.
One is the addition of the words "Collectors edition" in the upper left corner banner, and two is the cover price of 1.50
I have all four.