I’m not a button expert but there a couple knowledgeable people on the forum. Detail is everything when it comes to ID. I can’t see enough to even hazard a guess. Is it a one piece? What does the shank look like? You might put it on a plain background like a paper plate or white piece of paper and try a picture of the front and back. That lets your camera focus on the subject instead of the background. I hope it gets identified!