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.
I agree with Smokie, your US Navy button is pre-civil-war, by a lot, actually. You didn't say it's a 1-piece button, so I'll assume it's a 2-piece. The eagle looks toward the button's left. That makes it a cuff (or kepi) version of Albert's NA-101 through 103.... dating from the late 1830s into the 1840s. (Navy Eagle facing to right is a bit later, late-1840s to 1852, when the Navy changed the emblem to show the eagle standing on a horizontal anchor.)
The reason I said "or kepi" (size) in the paragraph above is, you said your button measures 1/4" in diameter. Are you sure you're not mistaken about its size? I've never seen nor heard of a US Navy button which is 1/4" (6.5mm) in diameter. Smallest one I know of is the kepi-hat strap button, 13mm (1/2") in diameter.
Smokie is also right about a lot of very-prewar US Navy buttons turning up on civil war battlefields and army campsites. Apparently, more than just a few guys wore dad or grandad's uniform... or, they used whatever Military button was near to hand when they lost one off their coat.