1970 (Vietcong Issue) Lenin, 30xu horizontal pair imperf. between, also at right, unused without gum, v.f. (Image)

Est.US$150

1978 Fourth Trade Union Congress, 10xu variety black color inverted, horizontal pair, unused without gum as issued, v.f., with 2008 APS certificate (Cat No. 934var) (Image)

Est.US$400

1979 Einstein, 12xu variety black color omitted, sheet corner margin block of four, unused without gum as issued (also a regular block of four), also imperf. horizontal pair, used, plus the very rare imperf. pair, black color inverted, used, v.f., the latter with APS certificate (Cat No. 983var) (Image)

Est.US$500

1984 Vietnamese-Soviet Culture Palace, 20xu imperf. top left sheet corner margin block of eight, yellow background inverted, unused without gum as issued, v.f. and striking error, with 2006 Alex Rendon certificate (Cat No. 1360var) (Image)

Est.US$350

1985 Hai Phong Bridge, 5d block of four, variety blue color inverted; also an additional block of four, blue color completely omitted, unused without gum as issued, v.f. (Cat No. 1508var) (Image)

Est.US$500

1985 Elections, 1d orange and black, imperf. pair, black color (center and inscriptions) inverted; also 50xu imperf. pair, printed on both sides, double and once inverted (without inscriptions) on back, both obviously printer's waste but rare, v.f., with 2010 Philatelic Foundation Certificates (Cat No. 1596-97var) (Image)

Est.US$250

1986 First National Elections, set of two imperforate blocks of four, one printed on both sides (impression slightly doubled), the other with black color inverted, unused without gum, fine-v.f., spectacular varieties (Cat No. 1596-1597var) (Image)

Est.US$500

1986 Ernst Thalmann, 2d red & black, imperforate block of four, printed on both sides, one with black inverted, other with red inverted (Cat No. 1622var) (Image)

Est.US$250

1986 May Day, 5d imperforate horizontal pair, red color double, one inverted, unused without gum, v.f., rare (Cat No. 1624var) (Image)

Est.US$250