Newton Comics' The Amazing Spider-Man #11 was published 25 October 1975:
The cover is from Marvel's The Amazing Spider-Man #10:
The story contents are as follows:
The Enforcers!, originally published in The Amazing Spider-Man #10, March 1964
Thor and Loki Attack the Human Race, originally published in Journey Into Mystery #94, July 1963
The Thor story continues from The Amazing Spider-Man #10:
In order to accommodate the new title panel the second panel from the original story is omitted. Here's a scan of the missing panel:
The Doctor Strange poster in this issue is from the cover of Newton's Doctor Strange #4a:
The swap card is Spiderman (sic) Series A (1 of 15) No. 9. There were to be no more swap cards in The Amazing Spider-Man.
The expiry date for the contest is 8 December 1975.
This issue was the first in the series to include a cover date.
I am not saying a thing about the Newtonese green texta used on the cover background.