Overall: 3/4 in. ( 1.9 cm )
stamped: back: "LEWIS & O...ES/EXTRA RICH"
Brass button; stamped mark on back.
According to an attached label, this button was found in the garden of the Colonial van Deusen house in Ulster County, New York, and is part of the Nash Collection.
Due to ongoing research, information about this object is subject to change.