T.P.O.s STUDY: 1878-1906 group of envs or stationery with boxed types inc. 1878 pair to Cordoba or Genoa with red 8c (x2 for Genoa) cancelled by "ESTA AMBTE/F.C.ATUC. NO1" or "ESTA AMBTE F.C.S/(B.A.)NO04" and double-ring types inc. 1900 5c stationery postcard with "ESTAF. AMB/(F.C.C.ARGENTINO)". Many T.P.O. varieties and mostly fine throughout. (21 covers) Cross Reference: TRANSATLANTIC MAIL, TRAVELLING POST OFFICES (Image)