Original WWI U.S. Army 3rd Battalion 23rd Infantry Regiment Uniform Insignia Patch - 2nd Division Category_Receiver as Ingersoll wrote

as Ingersoll wrote

The shell is maker marked with the stamping on the underside of the rim ZC 0

Ready to research & display

The Commanders of the were Lieutenant Colonel Allen Maclean (1st Battalion) and Major General John Small of Strathardle (2nd Battalion)

but do show some oxidation

Original WWI U.S. Army 3rd Battalion 23rd Infantry Regiment Uniform Insignia Patch - 2nd Division Category_Receiver as Ingersoll wroteOriginal Item: Only One Available. This is an ultra rare uniform patch insignia from World War One for the 3rd Battalion of the 23rd Infantry Regiment (3 23), part of the U. S. Army 3rd Infantry Brigade. The patch features a blue felt circle background that measures about 3 1 4 inches across, with a sewn on white five pointed star with a high quality embroidered Indian Head in the middle. These patches are extremely rare and ones in this high grade