Might be wrong but they look like they might have come from a stamp booklet pane or mini-sheet... like the one above. If that is the case then they are labels and not stamps. I cannot place the country of origin so maybe someone else has ideas?
I'm not sure what they are. Proper postage stamps will have some type of identity and value. They are most probably a fantasy or cinderella type. What could have added value is if they were used for postage. I see the cancels but they would have needed to be left on cover.
I think I'd agree with Scotzm that they are a label probably attached to stamps. The cancels look North American, but I can't think of a US or Canadian issue that had these (though that doesn't mean anything). Perhaps some issue dedicated to technology or engineering. The items look very techie.
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