Hi Vintagesouth,
I can't tell which stamps you have by your description alone as there are several different stamps they could be. There were several USA Airmail stamps for 10c. Same with the postage due.
Are you planning on keeping the collection? Here's a way you can get an very general idea of which stamps you have and their realative value (is it a common stamp or one worth a few bucks, or one worth even more). Try the Mystic Stamp company website. They have an online catalog that shows most of the USA stamps, gives their Scott Catalog # and gives prices for mint (unused) and used stamps. Mystic is generally higher priced, but you can still get an idea of relative value and help with identifying which stamps you have.
http://www.mysticstampcatalog.com/2008/index.cfmHope this is helpful.
Dave N.
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