"The coat of arms of Puerto Rico was first granted by the Spanish Crown in 1511, making it the oldest heraldic achievement still currently in use in the Americas.[1] The territory was ceded by Spain to the United States in accordance to the peace treaty that ended the Spanish–American War in 1899, after which two interim arms were adopted briefly. A law was passed in 1905 that re-established the historical armorial bearings as the arms of the territory; after numerous investigations and amendments, the current version was adopted in 1976."

"El escudo de Puerto Rico fue otorgado por la Monarquía católica en 1511 y es el escudo más viejo del Nuevo Mundo. Fue adoptado nuevamente por el gobierno del Estado Libre Asociado de Puerto Rico en 1976."

Source: https://es.wikipedia.org/wiki/Escudo_de_Puerto_Rico

Source: https://en.wikipedia.org/wiki/Coat_of_arms_of_Puerto_Rico
Source: This photo comes from Google Images - original source unknown.