Watched this in black and white during Mexico '70.
Couldn't believe my eyes then and, having watched it countless times since, I still can't.
Gordon was laughing afterwards because of two things he later reported as Bobby Moore saying:-
"You're getting old Banksy, time was you'd have caught that" followed by "I've told you before about giving away soft corners!"
I once read a book on goal-keeping. A whole chapter was devoted to that fraction of a second!
Read his auto-biography. It is impossible to praise this man too highly.
RIP Banksy! Best goalie ever and one of life's true gents.