Watch List notes:

WINDSOR. Elizabeth II. 1952-present. CU Trial Die Strike (25mm, 5.67 g, 12h). London mint. Dated 1957. Britannia seated slightly right, striking coins; three coins on ground before her; to right, dolphin upward / ROYAL MINT ~ TRIAL DIE ~, hexagram; 1957 (date) in center. Cf. DNW 135, lot 844 (for type). Brown surfaces. EF.

From the Dr. Jay M. Galst Collection.