Early black mark examples of Cardium on Coral. Cardium on Coral No. 3 (Degenhardt number D257) on left, 3-3/8ths inches high with pink tint and first black mark (1863-1890), and Cardium on Coral No. 4 (Degenhardt number D256) on right, 4-1/2 inches high, untinted, with second black mark (1891-1926).

There were four sizes of Cardium on Coral produced by Belleek, and the largest (which Richard Degenhardt christened "Number Four" in his invaluable reference) was produced right up into the 1980s (and possibly beyond) as Belleek's item number 434.