Two souvenir pressed pennies made from pre-1982 95% copper pennies:

1) Central Pacific RR Jupiter

2) Union Pacific RR No. 112

Both pennies have the same inscription on the back side: GOLDEN SPIKE NATIONAL HISTORIC SITE MAY 10, 1869

CPRR Jupiter and UPRR No. 112 were the two train engines that met at Promontory Point, Utah when the final spike was driven for the Transcontinental Railroad.