Maybe your pocket, not mine, still a rare Sulphide & I do recognise it from page 123, FR 11 -66 of Stanley Blocks book of sulphides a Roosevelt bust, exact match, the picture in blocks book courtesy of Bert Cohen. The old book price for a mint example is $400.oo, my how time passes, this marble has become super rare looking @ the price.
LINK :: https://www.ebay.com/itm/394454560399?hash=item5bd752ee8f%3Ag%3Al1sAAOSwi9dj5Reu&mkcid=1&mkrid=