I think it was around this time, either pre- or post-"Diamonds are Forever" that Burt's name was being floated as a possible replacement for Sean Connery as James Bond. I think it was Burt himself who said that Bond should be played by a British actor. That being said, there is a movie of his from this period, "Impasse" from 1969, that was shot in the Philippines, and the 1970-1971 television series "Dan August", that, I think, showed he had the acting chops to pull off a "serious" Bond if the producers wanted to go in that direction. There's a sequence in "Impasse" where Burt meets up with the criminals for a "drop" and he gets into an altercation with them. It shows that he at least had the physical part down.