re: Uruguay, 4 stamps with overprints - any ideas?
Given the dated overprints they must be revenues--there is a catalog that covers the revenue stamps of Uruguay for the post Forbin period (I don't own a copy).

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this post "'That's just it,' said the Hemulen in despair. 'It's finished. There isn't a stamp, or an error that I haven't collected. Not one. What shall I do now? ''Nature study!' declares the Hemulen. 'I shall botanize'. "