This first cover was sent to the US with the request "Send only by the first Argentinean ship to the U.S.," and instead of bearing a 15cSC, it bears a combination of the 12c and 3c stamps. The 12c stamp is always rare on cover.
The slogan reads: "Use airmail for out of country."
This cover to Colombia has a "passed by censor" mark that was most likely applied upon receipt."
