Hamed's chin was nowhere near as solid as Eubanks and in my opinion he would have hit the canvas more often if it wasnt for his unorthadox style. Calzaghe's chin was very decent.
Top class chin without a doubt. Has taken punches from some of the hardest punchers in and around his division.
Wayne McCullough has one of the best chins of all time IMO. He has taken multiple massive power punches from top class fighters at his weight and never gone down. In his latter days especially. Having shot after shot bounced off his head and still not keeling over. Sure Harrison, Larios, Morales and HAmed all hit him with everything he had about 40 times over and couldn't get him over even once.
Eubank had a good chin but watching his fight with nigel benn his body wasnt the best he looked hurt everytime he got hit in the stomach. Saying that though Benn was a fericios puncher
eubank had some whiskers but he didnt have the best british chin i would say mccullogh, ted 'kid' lewis, benny lynch, ken buchanan and bob fitzimmons all had better chins although he was maybe the same as ken
I still think Antonio Margarito. No other welter could have taken that kind of beating for nine rounds and be able to walk from the ring afterwards.