The first issues (Spider-Man 1-2, Hulk 1-3 and FF 1) are almost impossible to find in high grade.
The cover is made of the same paper as the inside pages (in color), and were printed in a very low quality paper. Moreover, a very low quantity of these issues has been printed. No need to say that any copy above VF is extremely rare.
After these issues, they started printing the interior in black and white and used better quality paper for the cover, like these ones below.
I had all issues in 9.0/9.2 when I was a kid but sold them all as a lot to start collecting original US versions. What a mistake!
Now I am trying hard to retrieve these issues in nice shape but the opportunities in the last 20 years can be counted in one hand.
I am still looking for nice copies of FF 1 and Hulk 2-3. The hardest of all is by far the Hulk #2.