50 Centavos

Colombia's shift to nickel-plated steel for this issue was driven by chronic shortages of cupronickel blanks and mounting pressure on the central bank's metal procurement budget through the mid-1960s. The Banco de la República had been navigating foreign exchange restrictions severe enough to make imported alloy coinage increasingly untenable. Nickel-plated steel was the pragmatic exit.

KM#228 has a known susceptibility to plating delamination, particularly along the rim — a direct consequence of the electroplating tolerances used at the Casa de Moneda de Bogotá during this transitional period.