Complete set of Columbian Issue stamps used on five covers to New York City with World's Fair Sta (Image)

E. $ 10,000-15,000

A remarkable use of the 30¢ Columbian on an entire with an advertising collar

30¢ Col (Image)

E. $ 750-1,000

50¢ Trans-Mississippi tied by U.S.-German Sea Post datestamp on small-format cover to France< (Image)

E. $ 750-1,000

Spectacular $1.00 Trans-Mississippi registered cover to Germany

$1.00 Trans-Mississip (Image)

E. $ 3,000-4,000

Second earliest recorded use of the $1.00 Trans-Mississippi

$1.00 Trans-Mississippi ( (Image)

E. $ 1,500-2,000

The earliest documented use of the $2.00 Trans-Mississippi issue--an outstanding cover from the c (Image)

E. $ 20,000-30,000

Spectacular registered cover to France with three-color Trans-Mississippi franking, including the (Image)

E. $ 5,000-7,500