Lot
1377 
Canal Zone, 1918-19 Ocean to Ocean Aero & Submarine Mail Service, two legal size O.B. covers; 1918 Fourth Liberty Loan Flight and 1919 Victory Loan Submarine Mail Service - both Cristobal to Balboa, each with special cachet date stamp and signed by loan chairman and director of posts C.H. Calhoun, Very Fine. Estimate $200 - 300.