Brass mystery piece

[McCDig]

Dug this in Baltimore City today in a park near a residential area. We found a good bit of construction waste in the fill but this doesn't look like in came from home construction.
It mounted to another piece, which explains the hole in the center. Any ideas?

 

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[trdking]

Looks like a saddle shield. Mounted police maybe?

 

[A2coins]

That's a good guess

 

[trdking]

Vintage Baltimore pd badge

That's a good guess

 

[ARC]

Perhaps an "anchor plate"...

 

[smokeythecat]

Anchor plate of base to an old flagpole.

 

[Hawks88]

Nice find. Congrats

 

[Subterranean]

Door knob plate?