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More research on the paper used in Ricordi's scores is necessary to discover whether crescent countermarks are present on sheets with the eagle/"GFA" combination, or whether perhaps the eagle and crescent bifolia combinations as illustrated in figure 2 might also contain the letters "GFA" on the bottom half sheets.
The countermark is a generally smaller or subsidiary mark; in most cases the countermark appears to be the initials or name of the papermaker, countermarks began to appear in paper during the 17th century.
Watermarks and countermarks are partly visible in the gutters of the margins, and appear respectively as a fleur-de-lis with an ornate base similar to Heawood 1533, and the roman numeral VI.