Once again a very rare piece of Costa Rica Philately appeared.
This time an horizontal marginal pair of Scott’s #47 (1901 Issue’s 5 cents stamp). The catalog only reports an used vertical pair. This one is a mint, NG horizontal pair -positions 41 and 42- out of a 100 stamp pane. How do i know the positions? Look a the bottom of the first stamp, you can see the perforation guides that are located between the 40’s and 50’s rows.
After reviewing the pair, a blue line becomes very clear on the lower right corner of the second stamp.