Hey T.J.,
The origin of okra is a matter of some contention; West Africa, Ethiopia, and South Asia are all suggested. The most recent reading I've done on it has, for now, convinced me that it originally comes from West Africa, but it is almost certain that it became naturalized in North Africa when it was smuggled in the clothing of kidnapped West Africans headed for slavery.
For okra stamps, try:
Dominica 460 (1975)
Haiti 535, C250, C252 (1965)
Montserrat 166 (1965) and 942 (1994)
The reading of the first line would be "Dominica" as the country name, "460" as the Scott Catalogue number, and "1975" as the year of issue. Please keep in mind that the stamps posted on this thread are not guaranteed to be an exhaustive list. And tut, tut, Rodney, for going from "not being able to find any" to "do not exist". Absence of evidence is not,
&c. ;-)
If you like okra and like vegetable gardening, my favorite okra I've grown is the open-pollinated varietal Red Burgundy. You can keep your own seeds and plant them the next year to get the same variety, unlike the packets you get in the garden center. You can get seeds from
http://seedsavers.org/ -- and if you want recipes, I'z gotz them too!
(I like to talk, if you haven't figured that out yet!)