Side-by-side double-barrel pistol, with single trigger. Chambered for .36-caliber percussion, with 3" to 6" round barrels. Finish blued, with walnut grips. Examples with ramrod mounted under barrel have been noted. Flute between barrels was marked, "Allen & Thurber", "Allen Thurber & Company" or "Allen & Wheelock". Approximately 1,000 manufactured in 1850s.