The Gronchi Rosa is a rare Italian postage stamp design error showing outdated country boundaries between Peru and Ecuador.

The rose-colored stamp was quickly replaced by a grey version with corrected boundaries, but some philatelic souvenirs using the Gronchi Rosa already existed.

Following this war, Peru annexed a vast territory in the Amazon basin, and this acquisition has been illustrated on maps ever since;[4] the error resulted from the use of an old geographical atlas that was mistakenly provided to the draftsman Renato Mura.

Preparations for the imminent trip of the President of the Italian Republic Giovanni Gronchi to South America were in full swing when, on 3 April 1961, the philatelic series commemorating the event was put on sale.

The design provoked immediate protests from the Peruvian Ambassador because the incorrect borders excluded the part of the Amazon that now belonged to Peru,[4] although this annexation was contested by Ecuador.

An official press release of the Italian Post in 1966 mentions 79,625 specimens that escaped the recall,[2] 90 of which are kept for postal museums and 80 as gifts to diplomats.