American patent Allen boot pistol

nipple pistol with double action only mechanism, semi-rearloading, marked "Allen'S Patent" on the side of the hammer; datable to the 1940s of the 19th century, it was a classic insidious weapon, to be kept hidden under clothing & nbsp; or tucked into the boot, or perhaps in a garter ...; not working, however in good aesthetic condition

length 20 cm