What is the name of the old black and white movie from the seventies where a woman is being chased by a doll with sharp teeth?

There was "Trilogy of Terror" from around that time period but it was in color. It was one of three stories, I never can remember the other two but the doll has imbedded itself in my brain forever! Karen Black was in the starring role in that story. If you are talking about the same story: The doll had a chain she removed and unleashed its power. She tried to kill it several different ways without any luck. One of the ways was putting it in the bathtub in a suitcase and attempting to drown it. I won't reveal the ending, though for those who haven't seen it or haven't seen it in a while. It pops up from time to time on DirectTV on one of the the Starz channels. If there was a black & white story like that there could have been one from the Twilight Zone or The Outer Limits or Night Gallery. But I know for sure that "Trilogy of Terror" came out in the '70's. I had to sneak in to watch it because my parents thought it would be too scary. But I managed to watch it anyway and they were right. It was too scary and I don't even like to think about it too much even now!!!!