Narex and Irwin,
Czech and Chinese (Sheffield if they are old enough to be actual Marples, which Irwin bought and ruined. Current ones are Chinese)
I have some of the older Sheffield Marples Blue chips, and a discontinued variety I can't recall the name of that had more durable "hammer friendly." handles. (yellow clear, instead of the opaque blue)
I've compared them to some that I got later that are Chinese.
Interestingly the Chinese have better finishing than the Sheffield, flatter bottom's less obvious machining marks, but the steel simply not as good at taking or holding an edge. (But these are about 5 year old Chinese (or more) and I know that Chinese steel has been constantly improving. )
If you can find the Sheffield ones, they are worth taking to time to flatten and hone up to be sure.
Now the Narex, is simply one of the best buys in current chisels.
Wait, what's this thread about?