How Did This Machinist Make This Surface Gauge?

You guys got me curious about the one I have collecting dust on the shelf. I found the stamp. Lufkin model 520. I am missing the shorter arm and scribe tool but the end scribe is there. The base is a little too big to use as a cutter height checker for my lathe. I'll keep an eye out for a smaller one that can fit on the flat that the compound pivots on. If I were to make a custom length arm for it what kind of steel would be a good choice that's not too tough to work with?
 
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