I have an antique pin with Presidents Lincoln , Grant and Garfield’s pictures on it. The pin is about 3″ long and about 3/4″ tall. The background appears to be bone colored , maybe ivory. Picture of Lincoln is on left, Grant is in the center (larger picture of Grant) and Garfield is on right of pin. The ivory colored background is inlayed in brass. Could you identify this pin and appraise it. Thank you for your attention.