12c on 6c Offices in China (K6). Mint N.H. top plate no. 7837 block of six with extra wide selvage, brilliant color, choice centering, post-office fresh
EXTREMELY FINE. A BEAUTIFUL MINT NEVER-HINGED WIDE TOP PLATE BLOCK OF THE 12-CENT OFFICES IN CHINA ISSUE.
With 1986 P.F. certificate
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