A serpentine pen knife with a very pronounced taper and curve; in the 19th century it would have had a Wharncliffe blade at its larger end but later examples do not necessarily carry that specific blade. Technically, these later examples with clip or spear point master blades should be classified as Serpentine Pen Knives. See also: Serpentine Pen Knife, Baby
Copperhead Serpentine Pen Knife (does not have a Wharncliffe master blade)