The Byron Reed example of the 1863 shield obverse design with motto 'God Our Trust' combined with the reverse with 2 Cents curved struck in pure copper.
Examples exist in the following combinations:
Bronze & Copper J312 & J312A/P377 on multiple weight planchets ranging from 76 grains all the way to 101 grains.
Copper-nickel J313/P378 with about a dozen known.
Aluminum J314/P379 which may be unique and is ex J.E. Drew, Simpson-Heritage 11/20 - PCGS65.
Photo from the Byron Reed Collection; owned by the City of Omaha, Nebraska; on loan to The Durham Museum.