O) 1879 EL SALVADOR, GENUINE USAGE, EMBOSSED POSTAL STATIONERY OF WHICH A PHOTOGRAPH IS ATTACHED, ALLEGORICAL FIGURE OF EL SALVADOR ROULETTED SCT 20 5c, COST OF ARMS SCT 13 1c, THE PHILATELIC FOUNDATION NWE YORK 10016 EXPERT COMMITTEE  -PF - CERTICATE, VERY NICE