Collecting American military arms demands attention to provenance, mechanical history and the small alterations that mark transitional periods. Few artifacts better illustrate the shift from flintlock to percussion and primer systems than this exceptionally rare Civil War–era conversion, notable to historians and tactical collectors alike.

HARPERS FERRY RARE BUTTERFIELD CONVERSION OF 1816 HARPERS FERRY MUSKET

This 1 of 200 example represents a documented conversion: originally produced at Harpers Ferry in 1836 and altered by Jesse S. Butterfield with his pellet primer system after the outbreak of the Civil War. For collectors seeking a single-shot piece with battlefield provenance, this is a standout.

Why this Butterfield conversion matters

The conversion is significant for mechanics and historians. Converted in 1861, the musket retains a 42″ round smooth bore in .69 caliber — the common large-bore military standard of the early 19th century. The Butterfield pellet primer system is a transitional ignition solution that improved ignition reliability over traditional flintlock operation without requiring full replacement of service arms, making examples like this rare survivors of mid-war armament upgrades.

Shop this product to view condition photos and original markings that confirm conversion authenticity.

Specifications and condition

Make, markings and rarity

Brand: Harpers Ferry. Model details listed as Various. Barrel is marked “Butterfields/PHILADA” and the lock plate reads “Butterfield’s/Patent Dec. 11, 1855/Philada.” The rear of the hammer is stamped “Harpers/Ferry/1836” — these markings are critical for verification and cataloging.

Physical condition

Metal components show a smooth grey patina with pin-prick oxidation consistent with age. The stock is serviceable with raised grain, minor nicks and dings that reflect use rather than abuse. As a historical single-shot musket, it presents stable condition appropriate for study and display.

Price is listed at $8500.99 for this Single Shot Civil War rarity. View product details and pricing to confirm current availability and purchase path through the retailer.

Collector use and display guidance

Given its .69 caliber, original 42″ smooth bore and documented conversion history, this musket is best suited for museum-quality display, research reference, or an advanced collector’s cabinet. Handling guidelines should prioritize conservation: control humidity, avoid abrasive cleaning of original patina, and document provenance for future valuation.

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