The first one is from Cuba, also used in Puerto Rico. "Ultramar" is Spanish for "overseas". This stamp is Cuba #65 in Scott. Minimal catalogue value. The second one is hard to identify because the scan is rather small, but I think it is from Greece.
The The International Society of Worldwide Stamp Collectors has a fantastic website. List every word possible, and tells you the country it is from. Try it. I love it
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