The flag of which South American country is unusual in having a different emblem on either side?

The flag of Paraguay (Spanish: bandera de Paraguay) was first adopted in 1842. Its design, a red–white–blue triband, was inspired by the colours of the French flag, believed to signify independence and liberty. The flag is unusual because it differs on its obverse and reverse sides: the obverse of the flag shows the national coat of arms, and the reverse shows the seal of the treasury. It was revised in 2013 to bring the flag towards its original design. It has a ratio of 11:20.

The colours of the flag are believed to be inspired from the flag of France to show independence and liberty, and the coat of arms represents the independence of Paraguay. The emblem on the reverse side is the seal of the treasury: a yellow lion below a red Phrygian cap on the top of a pole (symbolising liberty) and the words Paz y Justicia ("Peace and Justice"). The differences in the obverse and reverse sides comes from the period when José de Francia was in power (1814–1840). On July 15, 2013, the flag was revised. The coat of arms was simplified and the design was brought closer to its original form.