United States UNITED STATES POSSESSIONS CANAL ZONE Flight Covers
Sale No: 0120
Lot No:331
Symbol:e
1919 (7 May) first trip "Ocean to Ocean" Submarine Mail Service from Cristobal to Balboa Heights, pre-printed Liberty Loan Committee, two legal-size envelopes with appropriate cachets, one endorsed "sample", the other signed by Director of Posts and Chairman of the Victory Loan committee", fine (Image)