b'70392P Trees - Proofs: Algeria 1977 Flowering Trees Courvoisiers original colour separations & completed designs,all imperforate affixed to the official Archival album pages [#1661], dated 2/8/1977. Beautiful & unique (20 items). .$400600393 394393P Trees - Proofs: Algeria 1981 World Tree Day Courvoisiers original colour separations & completed designs all imperforate and affixed to the official Archival album page [#1824], dated 13/5/81. Beautiful & unique (11 items).$250300394P Trees - Proofs: Algeria 1983 World Tree Day Courvoisiers original colour separations & completed designs (not in issued denominations), all imperforate and affixed to the official Archival album page [#1913],dated 1983. Beautiful & unique (12 items). $250300395395P Trees - Proofs: Algeria 1993 Flowering Trees complete set of imperforate colour separations for the three denominations affixed to a single page from the printers records. Ex Courvoisier Archives. (18 proofs) $300350'