unused 1962 (Dec.) Scientists 8f. Tsai Lun, variety with erroneous vertical inscription with extra character, fine unmounted mint. Yang C297a, US Photo$600
unused 1962 (Dec.) Scientists 8f. Tsai Lun, variety with erroneous vertical inscription with extra character, fine unmounted mint. Yang C297a, US Photo$600
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
