5c black & blue postal stationery envelope with '1910' overprint in black and additional 'Avis de recepcion en retour' & Black BARS overprint (H&G D6) used with SAN SALVADOR cds, Addressed to SAN JUANITO, HONDURAS with TEGUCIGALPA oval transit marks and manuscript 'Sn Juanito, Honduras' arrival mark on reverse. Rare envelope in used condition.