Dangerous Assignment TV opening

In the lead-in to this television series, star Brian Donlevy is walking down a street in full evening attire, and stops to take a drag from his cigarette. Suddenly a knife comes flying through the air and sticks in the telephone pole beside him. With the help of modern technology, you can slow down the movement and blow up the screen, and see the thread on which the knife traveled, but probably the original viewers never caught it.