Not sure which way this goes, but probably not sideways like it is. One way I could almost see a face, and the other way maybe a lady in a dress? Any thoughts?
And the back
As always, help is appreciated in IDing it or at least giving me a time period. Thanks!
Without a size mentioned for reference, or the conditions/location in which it was found, I'm thinking possibly a dress cuff-button.
It looks to be made of pewter, but then again, you didn't tell us what type of metal it is.
Due to the fact that it's of one-piece construction, if it's actually pewter, might make it late 18thc.
Your button has the wrong form of loop to be a pewter button... so I'd say it appears to be silverplated brass button. Having an open-framework body suggests it is a late-Victorian-era button.