1992年中国古代科技发明发现(第1组)纪念银币22克风筝等3枚 完未流通
CHINA. Incomplete Piefort Proof Set, 1992. Inventions & Discoveries Series.KM-P23, P24 & P25. Lot of (3) 5 Yuan pieces struck in silver. Double sealed in original mint packaging, with box of issue and certificates of authenticity. From mintages of 2,500 pieces each. Also includes and ancient compass in separate box. Pieces in set are seismograph. Ancient kite flying and bronze metal working. Two small white spots on bronze metal working on reverse, otherwise, all areGEM BRILLIANT PROOF.
