Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Probably a fashion button. Looks like this Domed Crown & Shield one on Waterbury's site.
Domed Crown & Shield - Crowns - Waterbury Button
View attachment 828305
GpSnoopy is on the right track -- it is definitely a "Fashion" button, made for fancy civilian-usage coats/jackets.
Another ID-clue, in addition to the design on the button in GpSnoopy's photo:
"Fashion" buttons were (and still are) often made with a black paint coating, for a different "finish" than shiny brass... and we see remnants of black paint on your button.
You asked if your button has a British crown. Actually, it seems to most closely resemble the Empirial Crown of the Prussian (German) Empire, from the 1800s through the end of that Empire shortly after World War One.
Probably a fashion button. Looks like this Domed Crown & Shield one on Waterbury's site.
Domed Crown & Shield - Crowns - Waterbury Button
View attachment 828305