here is a navy civil war button

[diggerbrad]

Here is a navy civil war button thats hard to find these days im lucky to even own one

 

[bofusmosby]

If that's a 1-piece button (can't tell), then it pre-dates the Civil War by decades. It looks like the ones we find down here in Florida from the Second Seminole War (1820's - 1840's)

That's a good find!