Antique rare bubble glass portrait

I have a 1914 - 1918 WW1 U.S soldier portrait in a bubble glass frame. I believe his a corporal. The frame or the picture has any marking or dates of any kind im sure if you take it out of the frame there''s one. Don''t want to rip open the backing paper cause it all looks original. The picture frame those have a chip on the right side. But besides that it looks amazing for something so old and fragile.
Sorry about the picture everything reflects from it.
Check last 4 picture of other site selling them im asking $225 obo