It was also used by Bond in "From Russia with Love"
Again, by Connery (in fact the same exact gun he used in FRWL) in "League of Extraordinary Gentlemen"
By Peter O'Toole in "Lawrence of Arabia"
and I'm sure countless other films.
It's the scene where they signal the Nautilus and it WAS the same one used by Connery in FRWL according to Simon Atherton who said they sent it over with a note to Connery saying "Say hello to an old friend"