Auction #95 Worldwide Air Post Stamps and Philatelic Rarities of the World

1972, Wildlife Conservation, 8c multicolored, complete transition sheet of eight se-tenant blocks of four, black engraved color (picture, description and denomination) strongly shifted to the bottom left, resulting in stamps at top four horizontal rows have doubled or omitted ''United States'' variety, full OG, NH, VF, an attractive and rare item, Est. $1,000-$1,200