Well, guess thats all cleared up for the most part. I didnt have the comics in front of me so pulled up all the issue numbers and such from www.spiderfan.org THX you seem pretty knowledgeable on the Spider-Man comics, big fan?
They did restart the numbering after i think (from memory) #441, this was v2 which ran for 58 (or 60 have conflicting info) issues. it was then returned to v1 (which is current) and i believe they picked up the numbering from 500 (where v1 would have been if v2 was all part of v1). Im not sure on this so if anyone knows for sure that would be great.
I do know that some stories were reprinted under different titles, but you said the title of yours is The Amazing Spider-Man[\i] so i am at a loss as to why it would be number 6. though based on what you posted it seems they did keep the real issue number on there.
whats strange is i remember the scene with MJ saying she's going to the beach, but i remember it from one of the ones before we finally see her but her face is obscured. I thought that was the first time they showed her, but ive only read the first 110 comics.
-Darth Simon