A) German Silver (40% Ni, 40% Cu, 20% Zn), J-149. R6
B) German Silver (30% Ni, 60% Cu, 10% Zn), Thick planchet, J-150. R7
C) German Silver (30% Ni, 60% Cu, 10% Zn), Thin Planchet, J-150a. R7
D) Copper Nickel (40% Ni, 60% Cu), J-151. R6. Typically on a defective planchet.
A) Copper, J-151b. R7
B) Copper Nickel. J-151c. R7
C) Billon. J-151d. R7