I received few months ago this lovely cover from El Salvador with 3 nice stamps and lovely oval postmarks. First stamp is from set History of Aviation in El Salvador, issued on 7.12.2017. On second stamp is Canonization of Saint Oscar Arnulfo Romero, issued on 3.10.2018. And third one is dedicated to Ernesto Antonio Claramount Roseville, and is issued on 20.7.2016.
These nice postmarks are also on the back of cover.