Hob or Punch Shoulder Outlines (so-called "Longacre's Doubling"). Common on many denominations and coinages of the era, world-wide. Certainly not restricted to James B. Longacre's work. Longacre designed the Indian Head Cent.
James B. Longacre was appointed Chief Engraver of the MInt on September 16, 1844, after the death of Christian Gobrecht. Longacre was Chief Engraver until his death on January 1, 1869.
JT Stanton Flyer http://hermes.csd.net/~coneca/content/StrikeDoublingFlyer-PDF.pdf
1880-P VAM-10 (unofficial)
1880-S VAM-"pending" (Unofficially deemed C3c for study purposes)
1882-P VAM-"pending" (Unofficially deemed C3a-1 for study purposes)