The American collection, consisting of 137 Maya ceramic artifacts from El Salvador dating to the Late Classic period (ca. AD 600–900), was assembled in 1956 at the locality of San Marcos Lempe (Usulután, El Salvador) by the Italian agronomist Cesare Fabietti and donated to the museum in 2002. The collection is on public display, is fully accessible online, and has been the subject of a detailed publication.