I have access to some really accurate grind gauges and this is what I see. 0001 to 0.0003 which I like because you can shake them off with a surface grinder and they still fit. If you're working where you need more accurate blocks, you shouldn't use 123 blocks. Excellent value for the size. The hardness was 62 HRC, higher than specified and the same hardness as heat treated D2 tool steel.
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