Private label from the Swiss printing company Galletet.
Very nice. I've never seen it, but my guess is that the labels were included as part of a pack of stationery/cards.
The cancellation also fits the name of the company. My guess, considering what services and products Galletet offers, is that it uses these labels on its own mailings to publicise its products. The PP, usually, stands for "port payé;" i.e., postage paid. I think it is unlikely to have been included as part of stationary or cards, as it would not be of use to the purchaser.
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