No Noisy Cricket? Perhaps a PT22?
No? OK...
So, back when that film was released, the 629 looked impressive, but manageable. It was not a world apart from a .375 revolver in size and it was the barrel that caught the eye.
I think any of the revolvers in the poll, whilst in keeping with the "most powerful handgun in the world" theme, would be so big as to look ridiculous on screen.
In addition, back then revolvers were still fairly common amongst police, but now semis dominate.
So, I'd have to therefore go with the DE. Probably the .50, just because it is a .50....