Art & Inspiration Trying to id this brass step plate

Been cleaning (still) out the shop and came across this. I always thought it was a step plate for a bus or truck. No doubt it's old but shows no real wear so maybe it never was installed. Before I butcher it into something else does Anyone have a clue to it's proper application? Thanks in advance.

 

from an old Government building?

 

Maybe from an elevator..

 

I remember seeing something like it in an old military installation building and it was a headquarters on a large installation. I'm thinking it was in the Eastern U.S. but cannot recall where. Possibly Georgia or Virginia.