The finest of the 4¢ Columbian Blue color error plate number multiples--one of the greatest Unite (Image)

E. $ 100,000-150,000

One of two extant plate number blocks of the 8¢ Trans-Mississippi error from the only pane ever d (Image)

E. $ 100,000-150,000

Rare 50¢ Trans-Mississippi plate block of eight

DESCRIPTION

50¢ Trans-Mississipp (Image)

E. $ 5,000-7,500

$1.00 Trans-Mississippi plate block of four

DESCRIPTION

$1.00 Trans-Mississippi (Image)

E. $ 15,000-20,000

This is the only $2.00 Trans-Mississippi plate number block of six--one other plate block of 25 i (Image)

E. $ 200,000-300,000

The unique 50¢ Trans-Mississippi cover postmarked on the First Day of Issue--one of the most outs (Image)

E. $ 50,000-75,000

The magnificent Trans-Mississippi Complete Set cover to England with all nine values, totaling $3 (Image)

E. $ 40,000-50,000