D
Deleted member 70749
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It's not a button -- it is a collar-insignia disc. Specifically, It is a US Army Infantry collar-insignia disc, and yours dates from 1917 to 1918, because it is "solid cast" (the emblem is an integral part of the disc, not applied separately) AND it has both the Regiment-number and Company-letter with the crossed rifles.
For detailed info (with photos) on dating US Army collar-insignia discs, go here:
Dating Metallic Insignia: Collar Disks