The stamp at the top right is Cuba E1 (a special delivery stamp issued after the US obtained control of Cuba during the Spanish-American War). It has a catalog value of $100+, but the condition on this particular example of the stamp will reduce value considerably (the straight edge and centering both hurt, as well as what looks like a general lack of freshness, though the stamp could be used, which is actually more valuable than unused). The Puerto Rico and Philippines overprints are unusual though not valuable (maybe a few dollars catalog value there). The 6-cent stamps have a little value (i.e., non zero) though again condition issues work against them and off-condition US material mostly sells for far below catalog value. One of them is Scott #224, the 1890 issue (catalog value back in 2012 was $25), one probably #271 (8.50), and the other is #305 (5.75). Those values are for very fine stamps, which these are not.
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