This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Colombian Airmails workbook by Dieter Bortfeldt. en private airmail stamp of Colombia reproduced on book cover Scan of original COLOMPHIL and Compania Colombiana de Navegacion Aerea stamp PDColombia Philatelic literature Airmail Stamps of Colombia Book covers Philatelic fakes and forgeries
Page 2023 Free-images.com. All images are Public Domain