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Sorry to have to disappoint some people's hopes... but glad to save them from wasting their money. Your button's self-shank back with a square/rectangular shank means it is from no earlier than the mid-20th-Century. So your "eagle button" is either a reproduction made for use by civil war battle re-enactors, or a Fashion button. If its front is flat it's Fashion, if domed it is a civil war repro.