Hello
I was reviewing the papers and I found the grooves only in Spanish Gummed Paper stamps. The others were completely smooth.
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The stamps that I saw were mint so is that was not produced by washing the stamps off envelopes.
The spanish paper was used in very few emissions during the years 1991-93 including commemoratives stamps.
Novarode: only 1989
Spanish: 1991-92-93
Harrison: 1991 to 1996 (even until now!!)
Harrison is the principal paper supplier of CdM (for stamp production).
Best regards
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