These are my brand new BC 272's.
This is the casting number. All my journals have similar numbers on them too.
THIS, is what you need to be looking for. This is the grind #
(In this case its BC 101-EX And 180* on the other side is BFU5)
These are the numbers that matter. They are very small. VERY small and etched lightly in the portion you see in the picture.
This is where you'll find your answer.