Push dagger

[5] It was a common weapon in the city during the 1800s and was usually slipped into a boot or concealed inside a coat sleeve or else hung on a waistcoat button by a strap attached to the knife's leather sheath.

[11] The San Francisco style of push dagger tended to have a slightly longer blade than that of the gimlet knife and was most often equipped with a T-handle made of walrus ivory.

[11] During the latter half of the 19th century, the push dagger also enjoyed a brief period of popularity in Britain and Central Europe, particularly in Germany, where it was called the Stoßdolch or Faustmesser, meaning "push-dagger" and "fist-knife", respectively.

Originally most of these weapons were fabricated in the field from readily available materials such as metal stakes, but soon factory-made examples of knuckle knives and push daggers appeared at the front, and were used by both sides in the war.

In Britain the Robbins-Dudley Co. of Dudley, Worcestershire, a metalworking company, was one of the first commercial producers of specialized wartime knuckle-knives and push daggers for private sale to individual soldiers and officers.