Hi Sami, assuming there are no grills on the backs of the Stamps they would be Scott catalog # 65, which is a common stamp. The from the USA is probably someone bored with a Pen. Check the backs of the Stamps and see if there is a checkerboard looking pattern embossed into the paper.
At least the writing on the 2nd one looks contemporary. The person sending the mail might have written it, or a bored postal worker. Either way, I like it!
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