Shou Lung copper was any copper coin which was not immediately recognizable, and therefore declared to come from the mystical East and given a value of 1 cp. Only a small number of these coins actually came from Shou Lung, or any of the Kara-Tur nations, but the name stuck. Shou Lung silver was similar: any unknown or badly worn silver coin given a value of 1 sp.
Trade bars from Shou Lung were slender bars of silver, definitely oriental in origin, that had made their way to the West. Shou Lung trade bars were worth about 40 gp each.