As is often the case, we cannot rely 100% on what an internet website says about button backmark dating. I sincerely mean no offense at all to you, Doublet2a, but the Jimyce website you linked to is notoriously unreliable about backmark dating. See the Waterbury info in the next paragraph.
Xmarks73, your button is a World War 2 era US Navy uniform button. The key ID-clue: On your eagle-sitting-on-a-horizontal-anchor US Navy button, the eagle's head faces toward the viewer's left. That means it is a US Navy button made from mid-1941 on through the present day. But we can narrow your button's date even further. The Waterbury Button Company changed its name to Waterbury Companies in 1945. If your button was made after 1945 its backmark would say Cos. instead of Co. So we know for certain that your button dates strictly from mid-1941 to mid 1945.
