Proprietary, 1873, 50¢ green & black, violet paper. Blue date stamp cancel, P.F. states "diagonal crease, stains and soiling" but they have little effect of the appearance, Very Fine looking example of this Scarce stamp, with 2010 P.F. certificate.
Scott No. RB8a; $1,000. US$0 (Image)

Scott $1,000

Proprietary, 1873, $1 green & black, violet paper. Two different violet handstamp cancels, corner crease and tiny thin spot, F.-V.F. appearance a rare stamp, with 1991 A.P.S. certificate.
Scott No. RB9a; $3,500. US$0 (Image)

Scott $3,500

Sale No: 115
Lot No:1618
Symbol:(Cat No:RB10a

Proprietary, 1873, $5 green & black, violet paper. Uncancelled (not listed thus in Scott), small thin and pinhole, great colors, wonderful centering, Very Fine appearance, with 1991 A.P.S. certificate.
Scott No. RB10a; $11,000 for used.

AN OUTSTANDING EXAMPLE OF THIS RARE STAMP WHICH IS ALWAYS PLAGUED BY FAULTS DUE TO ITS LARGE SIZE. US$0 (Image)

Scott $11,000 for used

Proprietary, 1875, 5¢ black, rouletted. Light violet manuscript cancel, faint crease and small thins, lovely Fine appearance, a rare stamp, with 2005 A.P.S. certificate.
Scott No. RB16c; $1,850. US$0 (Image)

Scott $1,850

Proprietary, 1875, 6¢ violet blue, rouletted. Faint crease and small thin, Very Fine appearance, with 2010 A.P.S. certificate.
Scott No. RB17c; $1,100. US$0 (Image)

Scott $1,100

Proprietary, 1875, 6¢ violet blue, rouletted. Neat straight line cancel, small shallow thins, Very Fine appearance, with 2005 A.P.S. certificate.
Scott No. RB17c; $1,100. US$0 (Image)

Scott $1,100

Proprietary, 1875, 6¢ violet, rouletted. Purple cancel, small thins and minor surface scuff, Very Fine appearance and a very rare stamp, with 2011 P.F. certificate.
Scott No. RB18c; $2,500. US$0 (Image)

Scott $2,500

Sale No: 115
Lot No:1623
Symbol:Cat No:RB42

Proprietary, 1914, 4-3/8¢ black. O.g., never hinged (light natural gum bend, not mentioned on cert.), fresh and F.-V.F., a lovely example of this rare stamp, with 1982 P.F. certificate.
Scott No. RB42; $3,000.

This is a difficult issue to obtain with decent centering as many have perfs touching on one or two sides. US$0 (Image)

Scott $3,000