The Sacred Cows Official Issues (1914-1941) (SG O1-O52). 1915-41, 1/2a black, used, on thin wove paper, rouletted in colour, type A, native overprint type O1 in black, very fine and scarce (SG £450). (Image)

1915-41, 1/2a black, on thin wove paper, rouletted in colour, type A, native overprint type O1 in black, complete sheet, tied on the reverse of philatelic cover by black cds, dated 14 March 1919, an outstanding exhibition showpiece, this is the only genuine Official cover we have seen or have been aware of over 44 years of researching Bundi, cert. RPS (2002) (SG £27'000+). (Image)

1915-41, 1/2a black, unused complete sheet of four, on thin wove paper, rouletted in colour, type A, native overprint type O1 in red, Benns setting 3, very fine and scarce, cert. BPA (2002) (SG £1'600). (Image)

1915-41, 2a emerald, unused complete sheet of four, on thin wove paper, rouletted in colour, type A, small English overprint type O2 INVERTED in black, Benns setting 14, very fine and scarce, cert. BPA (2002) (SG £1'500), unrecorded by Benns. (Image)

1915-41, 1/4a ultramarine, unused two singles in different shades, on thin wove paper, rouletted in colour, type B, both small English overprint in black, all from a very scarce setting 23, a scarce pair. (Image)

1915-41, 1/4a ultramarine, unused single (thinned) and used two singles, on thin wove paper, rouletted in colour, type B, small native overprint type O1 and small English overprint INVERTED in black, all from setting 10, a scarce trio. (Image)

1915-41, 1r lilac, unused complete sheet of four, on pelure paper, setting 7, rouletted in colour, type B, with O1 small native overprint in black applied sideways, very fine and a rare complete sheet (SG £1'900+). (Image)

1915-41, 1/4a ultramarine, unused complete sheet of four, setting 18, on thin wove paper, rouletted in colour, type C, with small native overprint in red applied sideways, showing position 1 with "first word bottom label raised" variety, fresh, excellent colour and impression, a scarce sheet. (Image)

1915-41, 1/4a ultramarine, unused, setting 23, on thin wove paper, rouletted in colour, type C, with small native overprint in red, a fine and very rare single from this setting. (Image)

Unique reversed overprint 1915-41, 4a apple-green, unused complete sheet of four, on thin wove paper, rouletted in colour, type B on one and C on three, with O1 small native overprint in black showing variety "lines reversed long line on top, short line on the bottom", a very fine and unique showpiece. (Image)

1915-41, 10a brown, unused complete sheet of four, on pelure paper, setting 11, rouletted in colour, type C, with O1 small native overprint in black applied sideways, very fine and a scarce complete sheet (SG £480+). (Image)

1915-41, 10a brown-olive, unused, on thin wove paper, rouletted in colour, type C, with O2 small English overprint doubled in both black and red, a fine and very rare variety. (Image)

1915-41, 10a yellow-orange, unused, on thin wove paper, rouletted in colour, type C, with O2 small English overprint in black, hinge thin, a fine and very scarce shade (SG £180). (Image)

1915-41, 12a sage green, unused bottom left corner sheet marginal single, settings 11, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black applied sideways, crease, fine and very rare, unrecorded setting by Benns. (Image)

1915-41, 12a sage green, unused, on thin wove paper, rouletted in colour, type C, with O3 large English overprint in red, fine and very rare (SG £1'100). (Image)

1915-41, 1r lilac, unused complete sheet of four, on pelure paper, setting 9, rouletted in colour, type C, with O1 small native overprint in black applied sideways, very fine and rare complete sheet (SG £900+). (Image)

1915-41, 1r lilac, unused, on pelure paper, rouletted in colour, type C, with O1 small native overprint in red, showing DOUBLE OVPT, very fine and rare overprint variety (SG £650+). (Image)

1915-41, 2r red-brown and black, unused bottom right corner sheet marginal single, settings 11, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black, fine and very rare (SG £700). (Image)

1915-41, 2r chestnut and black, used (small hinge thin), settings 11, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black, fine with clear central cds, unusual shade and very rare (SG £700+), cert. BPA (2017). (Image)

1915-41, 2r red-brown and black, unused complete sheet of four, on thin wove paper, rouletted in colour, type C, with O2 small English overprint in black, thin in margin only, fine and very rare (SG £900+). (Image)

1915-41, 3r grey-blue and red-brown, unused, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black, fine and very rare (SG £2'250). (Image)

1915-41, 3r grey-blue and red-brown, unused left sheet marginal single, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in red applied sideways, fine and very rare (SG £2'250). (Image)

1915-41, 4r emerald and scarlet, unused, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black, fine and rare (SG £500). (Image)

1915-41, 4r emerald and scarlet, unused, on thin wove paper, rouletted in colour, type C, with O2 small English overprint in black, fine and rare (SG £450). (Image)

1915-41, 5r scarlet and emerald, unused, on thin wove paper, rouletted in colour, type C, with O1 small native overprint in black, fine and rare (SG £500). (Image)