China 400th Anniversary of Xu Xiake explorer 3v Blocks of 4 1987 MNH SG#3478-3480 MI#2102-2104 Sc#2075-2077

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Condition: ** Mint Never Hinged

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Catalogue Numeration:
Stanley Gibbons No.: 3478-3480
Michel No.: 2102-2104
Scott No.: 2075-2077
China No.: J.136