Within the Ceres and/or Spink-Maury catalogues are several "variety" or subnumber listings that include the term "anneau-lune". Which I take to mean "moon ring".
Examples include some of the 1942 Petain issues.
Is this a "flyspeck" term for an oval or elliptical mark somewhere on the stamp?
When a dust particle is on the printing plate or cylinder, the "halo" around it does not receive ink and hence the French refer to it as a moon-ring....
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