NGC MS 61 (6640663-029).
Av. Tu duc thông bao "Tu Duc's current coinage" in four Chinese characters around the central perforation.
Rv. Around the central hole, the moon to the west and the sun to the east; above, the five planets and clouds; below, the sea.
Schr.- (cf.353) - KM.- ; Silver - 3.15 g - 24.5 mm - 12 h
Top Pop: the only graded example!
NGC MS 61 (6640663-029).
This reverse appears to be unlisted! With gray patina. Very rare. Superb condition.