Unusual marking seen

[Navy]

All,

In rambling through Alabama, came across 1916 DWM Army, about 85%, priced waaay too high. Interesting markings..100 R (Scriptic)3.1, which I make as 100th Infantry regiment, third company,weapon number 1. The markings were small, delicate and uniform; looked like they were pantographed.
Anyone ever seen markings like this?

Tom A
Wasting away in Huntsgaritaville