Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1028:
1988, Zoo Relief Fund, 10+5k and 20+10k, imperforate se- tenant block of five with label, three side margin block of four, control lines and lights at left and bottom selvages, full OG, NH, VF, a great modern multiple rarity, one of two known blocks of this issue, Raritan Stamps guarantee, Est. $10,000-$15,000, Scott #B145a imp
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