seeing as the page doesn't mention any butting, i'm guessing there isn't any. I get what you're saying when kaisei 019 and 022 are the 4130 alloy but are manipulated differently and are generally straighter. plus i'm sure there's japanese frames built with the nickel alloy steels and such.

but bad deal on that affinity. I got my en jay ess frame with hatta swan hs and sugino 75bb for 420 shipped. njs isn't out of reach, you just have to look for it.