waterbury button co

A Waterbury Button found in Baltimore The button pictured below was researched as being Waterbury Button Co. pattern 11328, classified as a "career uniform" button. Have you found a similar button or have detail as to the period and what type of uniform it decorated?

I found three of these little buttons that measure 1.5 cm, two of them are marked Waterbury Button Company on the back, the other is unstamped. They are very shiny. Any info is appreciated. Thanks! -O