That would be the BALL Corporation located in Broomfield Colorado, USA, makers of the Glass Mason Jar exported all around the world. Last year Ball produced over 60 million mason jars, the favorite glass jar of Old ladies and used for canning of veggies and fruits.
Pakistan by far. I've never ever seen a Pakistani fighter have a good chin. .. ever. Amir Khan, Adil Anwar, Adnan Amar, Uzzy Ahmed, Faheem Khan,Atif Shafiq etc etc etc etc etc Cuba second. They have terrible chins like the pakistanis but at least they have skills and ability to get to a decent level first. Cuban heavyweights in particular seem to have woeful chins. IF their number 1 Super heavy in the amateurs Pero turns pro he will have many embarrassing KO's.
Kid Gavilan The Cuban Hawk had a granite chin. Never stopped in 143 fights . At present the only Cuban fighter with good chin is Yunieski Gonzales.
China! 1.4 billion people, so percentage wise it has to be. It's in the name even, you can't miss it.
Not sure and not entirely proven quantitavely, I feel completely confident in my estimation that Pakistan isnt hiding a cadre of Iron jawed wariors