The crossed rifles generally indicates an infantry insignia, and, from what I understand, the wreath means a completed tour of duty. The crossed rifles replaced the hunting horn as the infantry insignia after the Civil War. I can't be sure it's significant, but if you look at the rifles they're not what you see on more modern insignia. I've got a couple of collar tabs from after WWI and the rifles on them are clearly bolt action. The rifles on the pin appear to be the old Sharps 45-70 which would lead one to believe the pin is an early version.