re: A FDC identification question - "Foil" cachets
The covers you are showing are Colorano Silk cachets. Along with the Ross foils and the Zarzin metal cschets, these were all gimmick glue on cachets marketed heavily during the issue period if the 1970s and apparently into the 1980s.
re: A FDC identification question - "Foil" cachets
lemaven:
The three FDCS you posted were made by three different companies: the top cover is by Modele Depost, #77 in Mellone. (I do not know anything about them, French?) The middle cover is by Western Silk and the bottom cover was correctly identified as being produced by Colorano "Silk" Cachets.
Perhaps this information might be helpful.
Respectfully submitted:
jrc