I am not really sure what brand of chain I have on my Norton right now. It is a Japanese one that I bought at a swap meet that I think was surplus from a shop that went out of business. It is nothing special. It is not an O ring or X ring chain. It is just a standard one. I have around 10,000 miles on it though. It is still not worn out. What I do that makes it last a long time, is at least once a year I boil it in a mixture of paraffin wax and gear oil. This mixture not only lubricates the chain very well, but I think it also seals out the dirt that normally gets between the links. I have a can of this mixture that I have been using for this purpose for about 20 years. Sometimes it gets a bit dry looking so I add a bit more oil. You just melt it, soak the clean chain in it for a while and then remove the chain while it is all still hot, letting the excess drip back into the can. In between I keep the chain lubed with chain wax or one of the similar chain lubes that go on thin and then thicken up.
I have had several chains that I used on my Triumphs for over 15,000 miles.
Nigel