WW I Letter from POW in Malta unfranked envelope addressed to USA, two strikes of circular "Post Free/ Prisoners of War/ P.C." handstamp plus nice strike of thee double oval "Free From Prisoners of War/ Malta/ PC" handstamp, manuscript return address on the backflap noting the Verdala barracks, also the engraved logo of "Oesterr. Lloyd/ Trieste" on backflap, typical bit of postal wear and a tiny edge break each side, Fine use