Philately. Brit. occupation, Reg letter with C.E.F. overprints on German issue Emperor´s Yacht SG.B2-B4 with CDS BUEA 3 NO 19 to Bern, arrival 5 XII. 19, in mixed franking with CAMEROUN FRANCAISE 1916-17 20C and pair Nigeria George V. 1/2P; very fine, stamps CEF are on letters very rare! (Image 1) (Image 2) (Image)