A breathtaking mixed-issue franking with 1¢ and 12¢ 1851 Imperforate stamps and the 1857 10¢ Perf (Image)

E. $ 5,000-7,500

A superb 12¢ 1851 bisect cover--only five recorded with the rare Sonora, California, year-dated s (Image)

E. $ 5,000-7,500

Well-tied 12¢ 1851 bisect accepted for postage on cover from San Francisco in September 1853< (Image)

E. $ 1,500-2,000

Rare 12¢ 1851 bisect and 3¢ 1851 combination with New York & Philadelphia Railroad datestamp< (Image)

E. $ 5,000-7,500

A spectacular "complete set" 1851 Issue cover from New Orleans to Mexico

12¢ Black (1 (Image)

E. $ 4,000-5,000

1851 Issue "complete set" franking on extraordinary quadruple-rate cover to Mexico

12 (Image)

E. $ 1,500-2,000

Extremely rare 1851 Issue franking to pay 45¢ British Mail rate to Buenos Aires via Southampton (Image)

E. $ 2,000-3,000

12¢ 1851 Imperforate and 10¢ 1857 Perforated franking paying 34¢ rate to Chile via Panama

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E. $ 1,500-2,000

10¢ and 12¢ 1851 Imperforate combination cancelled in red on cover to Peru

12¢ Black (Image)

E. $ 2,000-3,000

12¢ 1851 Issue cover to England and forwarded to France with a colorful array of markings

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E. $ 500-750

12¢ 1851 Issue and Great Britain mixed franking on cover to London and forwarded to Paris

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E. $ 1,500-2,000

A beautiful and rare "complete set" 1851 Issue cover to France, mailed in the period when these t (Image)

E. $ 3,000-4,000

Extremely rare double 21¢ American Packet rate cover to France with 3¢ and 12¢ 1851 Issues

(Image)

E. $ 2,000-3,000

Phenomenal 1851 Issue American Packet Direct cover to France with West Coast 5¢ surcharge

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E. $ 2,000-3,000

Stupendous 12¢ 1851 Issue franking with 15 stamps surrounding address to Germany

12¢ (Image)

E. $ 5,000-7,500

Impressive 12¢ 1851 Issue franking cancelled in red on double 30¢ rate cover to Germany

(Image)

E. $ 1,000-1,500

A beautiful 3¢ and 12¢ 1851 Issue cover to Germany by Prussian Closed Mail

12¢ Black (Image)

E. $ 1,000-1,500

The only known correctly prepaid 1851 Issue cover to Switzerland by Bremen-Hamburg Mail

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E. $ 2,000-3,000

12¢ 1851 strip of three on extremely rare cover to Holstein, then under Danish Crown rule

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E. $ 2,000-3,000

Exceedingly rare 1851 Issue cover to Greece with a 12¢ strip of three

12¢ Black (17), (Image)

E. $ 2,000-3,000

This beautiful cover is one of six recorded with a block of the 12¢ 1851 Issue, and it is the onl (Image)

E. $ 10,000-15,000

A magnificent and exceedingly rare 1851 Issue cover to Norway--this destination is rarely encount (Image)

E. $ 7,500-10,000

An extraordinary cover to Sweden with the 42¢ Prussian Closed Mail rate paid by a 12¢ 1851 and st (Image)

E. $ 4,000-5,000

Rare 1851 Issue cover to Russia with 1¢ and 12¢ stamps paying 37¢ Prussian Closed Mail rate

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E. $ 4,000-5,000

Rare 37¢ Prussian Closed Mail rate cover to Russia with 1¢ and 12¢ 1851 Issue

12¢ Bla (Image)

E. $ 4,000-5,000