Frontside:

Northrop Grumman - USAF

B-2 Spirit

Engraved Number is "4871"

B-2 Pioneers and Team Members

Backside:

Home of the B-2 Stealth Bomber

Northrop Grumman 1983-1999

Pico Rivera, California

1-1/4" diameter

Used, as-is.  Some oxidation, relief in good condition.  See attached pictures.