At first glance I thought, "Why would he make it out of 3/16ths?" Then I read the note up above at 3/32 and went, "Oh!". LOL Not 1/16th grad.
I have Rulers the same, 1/32 and 1/64 on one side and 50ths and 100ths on the other side. A Starrett Tri Square I bought in 1978.
That is some accurate grinding and a good photo.
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