There's a wide range of color for these issues because the purple ink was prone to fading. Michel doesn't give them different catalog numbers, presumably because the color variations were so numerous and on such a continuous spectrum that isn't not possible to draw any firm lines from one color to the next. For the past 10+ years, Michel has included notes under the listing for these issues:
Quote:
Color research has not yet been completed for this issue, so for the moment no new color variations can be cataloged (and expertized). The transitions both in ink as well as the interruptions in the gumming are mainly gradual; certainty in differentiating and expertizing these issues is only currently possible for the stamps cataloged above.
Posted 06/18/2023 06:23 am
