Military Insignia U S / 4 - Need ID

[Pocket Change]

This one looks brass, 25mm with screw back pin. Need Unit Name.

Thanks for the great info furnished below. PC

 

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[TheCannonballGuy]

US Army collar-disc insignia, representing the US Army's 4th Infantry Regiment.

Your collar-disc's "fabric-looking" background and the screw-stud on its back dates it to 1926-1937. Check this photo of the various forms, with dates given in the imagefile's title.

 

[CASPER-2]

ITS ACTUALLY WWI
this one is from 7th infantry
http://www.baystatemilitaria.com/WWI/WWIMetalInsignia.htm

 

[GpSnoopy]

I agree with WW1 or shortly after as per this link.
http://hglanham.tripod.com/metalinsignia/collardisk1.html

Certain of the disks included the regiment number and company letter on the face. The earliest of these disks are referred to as Type I disks. This type was in use from 1910-1924 and was the type used during the First World War. They have a background pattern that was plain or may be dots, cross-hatches, diamonds, etc. but these were manufacture variations and have no major significance.

The dating in CannonBalls image is still correct for the gilt versions.

Examples of Gilt Collar Disks Type I
The original concept of the bronze collar disks was that they would be worn on the service uniform as distinct from the blue dress uniform. In 1917 with the nation at war the dress uniform and its insignia was suspended. It was to be an olive drab and khaki war. Once the war ended the dress blue uniform was not restored for general use but for many the service uniform was too drab. The solution was to use gilt collar disks rather than bronze ones. Previously, gilt disks had been approved in situations were troops were wearing white dress uniforms and certain other situations. Army Regulations AR 600-35 of October 14, 1921 stated that collar disks might be bronze on service uniforms and gilt on white uniforms. On November 25, 1924 the bronze disks were dropped for peace time use on all uniforms. Those still in service were to have been polished to a bright finish.