American antique late 1800s
Silver Plate mug
James W. Tufts Boston MA
1261
Mary engraved on it
see photos for measurements
From Wikipedia:
James Walker Tufts (February 11, 1835 – February 3, 1902) is known for his founding of Pinehurst, North Carolina and for his development of a successful business in silver plate tableware. He also founded the Arctic Soda Fountain Co.