Chuvalo is a good one. 97 pro fights and as he says "kissed alot of girls but never kissed the canvas". Ray Mercer was a badass, small size heavyweight but iron chinned. Bert Cooper as well should have a mention too I feel.
Bert was one of the most exciting heavyweights of his time but iron chined he was not. In fact it was probably because he wasn’t iron chinned that was a contributing factor to why his fights were exciting.
Cooper did fight some heavy hitters in his day tho. His fight with Mercer was fantastic. And he took heavy shots. I know what your saying tho, he was able to be dropped thru out his time. I might have just been goin off his overall toughness and not so much his chin. He just loved to fight lol