This stamp is common on cover, and while I do not collect it, it comes with combined uses of this series often. The first cover is from 1943 and has tape censorship.
This cover is from 1941 and is uncensored. It bears the 10c Brown from the first printing. This printing saw limited postal use.
This cover, like the first one, is from 1943, with tape censorship.
These three covers are from the Continental Grain correspondence. The first cover is a 2.15 pesos rate.