
Thanks for posting these. Minimal catalog value or no, early Latin American look great in a stock book.
Here is your Chilean friend overprinted for air service (C11 1928):

This gentleman below figures big in 19th century Costa Rican issues (President Soto), here on a 10c issue from 1889 (#28 purchased MH for $0.13). The 50c issue #30 nearly broke the bank at $0.35.

I have a page of Ecuador as well and the early specimens are similar design. Early 20th century pieces are interesting too and I have a burgeoning collection of Dominican Airmails from the 1920s-40s...