Preliminary identification
Photo reference
1 uploaded photo
Overview
A seminal piece of American cartography, this map captures the Western United States at a pivotal moment of expansion and geopolitical flux. It features the short-lived Republic of Texas and the vast 'Upper or New California' just as the Mexican-American War was beginning.
Story
Published in 1846, this map was the essential guide for pioneers on the Oregon Trail. It depicts a version of America that only existed for a few years, showing Texas as a massive territory reaching into modern-day Wyoming.
Maker / Origin
Samuel Augustus Mitchell was the leading American map publisher of the 19th century, known for his distinct green floral borders. He revolutionized the industry by switching from expensive copperplate engraving to more efficient steel plates, making geography accessible to the masses.
Condition & Value
The map shows significant creasing and potential moisture staining, which is common for authentic folding pocket maps. The frame is a later addition; if original, the fold lines are expected, but the discoloration reduces the top-end value. Original 1846 pocket map editions in excellent condition can exceed $4,000 at auction.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Build on this identification
Layer in sold comps, value drivers, and venue guidance.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.