The Paquet reverse with "perfect ribbon" combined with the regular obverse die.
Its first appearance is believed to be as lot 693 in William Strobridge's 3/1863 sale.
Today, 4 examples are confirmed and illustrated as follows:
1) Judd, Kosoff 8/71, Bass-HWBRF - PCGS65, illustrated above courtesy of PCGS, click on the thumbnail image to enlarge.
2) Farouk, Kosoff-66 ANA, Kosoff 2/70, Morris Evans, Bowers and Merena 8/98, Superior 8/04, ANR 11/04, Simpson-Heritage 2/21 - PCGS61, cleaned and lacquered - illustrated below courtesy of Superior.
3) 1976 ANA, ANR 3/06, Jewell, Stacks-Bowers 8/11 ANA,Stacks-Bowers 3/12, Stacks-Bowers 11/12, Stacks-Bowers 3/13, Legend 10/21 - PCGS63, illustrated below courtesy of StacksBowers
4) Byron Reed-Durham Museum - ICG64, possibly from Doughty (New York Coin & Stamp April 1891 lot 323), illustrated below
Photo from the Byron Reed Collection; owned by the City of Omaha, Nebraska; on loan to The Durham Museum.
The R.E. Cox-Stacks 4/62 specimen is believed to duplicate either #2 or #3 above.
A single example, defaced, is known struck in copper J223/P266 and is ex Lefferts (1881), Farouk, Judd.
2 white metal splashers of the reverse lacking dentilation are known JA1858-4/P3176 as well as a set up piece for the reverse lettering JA1858-5/P3179.