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I would imagine they would use a small piece of metal from the same batch as the razor then after they temper and quench the razor along with the small piece of metal I would guess they would then...

Yeah 64 65 Rockwell seems a little far fetched we are talking Rockstead knife hardness there, talking of your razor if it were 62 Rockwell which is still very hard and you are not likely to find...

It's simple it's either the white or the blue it's been around for sometime I've seen razors knives and scissors from the early 1960s made from YSK2 I doubt very much you are going to find much more...

Yasuki Steel

(“White and Blue Paper Steel”)
This carbon steel, supplied by the HITACHI company based in Yasugi, Japan, is made from high-quality iron sand using smelting methods similar to those...

I've owned a few razors with Yazuki steel and still have one they are great razors, here's one I own a Eiko YSK2.
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