Need help button ID

[soonerdan25]

Small button found looks to be army early 1900s but not sure

 

Amazon Forum Fav 👍

DR.ÖTEK Metal Detector, Waterproof Gold Detector, Pinpoint & Terrain Modes, Professional Metal Detector - Grab it through Amazon!

[CRUSADER]

The US Army Great Seal buttons did start in 1902, so it is possible but they have been used through out the 20th C, so it's the backmark which will nail down the date range. What is it?