Ecuador 1948 20c Intermediate Die Proof + Printer's File Copy Proofs. Scott 510 var

Waterlow intermediate die proof for the 20c value, omitting the vignette of Rooseveldt. Die number handwritten in upper left corner, cylinder number in upper right and proof number in lower left. Includes two MNH blocks of file copy proofs of the finished stamp with punch holes and "checked for colour" notation in the selvedge, dated five months before the stamps went on sale. Unique.