1923 1/2a green, double overprint, one albino, vertical gutter pair, n.h., v.f., extremely rare (catalogued as hinged singles) cat. £340 (Cat No. SG O1a) (Image)

Cat. £340, Est.US$500

1923 1a chocolate, 1r brown & green, 5r ultramarine & violet, each double overprint, one albino, l.h. or h.r., fine-v.f., 1r with 1977 BPA certificate, cat. £540 (Cat No. SG O2a,O10b,O12a) (Image)

Cat. £540, Est.US$250

1923 5r ultramarine & violet, double overprint, one albino, h.r., v.f., with 1977 BPA certificate, cat. £200 (Cat No. SG O12a) (Image)

Cat. £200, Est.US$100

1929-33 1a-15r overprinted "Service", complete set of 11 blocks of four, n.h., v.f. (catalogued as hinged singles) cat. £2400 (Cat No. SG O16-27) (Image)

Cat. £2400, Est.US$1,000