1997, Machin head Courvoisier undenominated trial in light grey, complete sheet of 100 stamps on gummed coated paper (horizontal center perf. fold), gravure printing, left pane of gutter sheet of 200 stamps with imprint on left and on right selvedge. SPECTACULAR, RARE AND ATTRACTIVE, DISCOVERED IN 2017. (M)
1997, Machin head Courvoisier undenominated trial in flame red, complete sheet of 100 stamps on gummed coated paper (horizontal centre perf. fold), gravure printing, left pane of gutter sheet of 200 stamps with imprint on left and on right selvedge. SPECTACULAR, RARE AND ATTRACTIVE, DISCOVERED IN 2017. (M)
1997, Machin head Courvoisier undenominated trial in light grey, complete sheet of 100 stamps on gummed coated paper (horizontal center perf. fold), gravure printing, left pane of gutter sheet of 200 stamps with imprint on left and on right selvedge. SPECTACULAR, RARE AND ATTRACTIVE, DISCOVERED IN 2017. (M)