Welcome to the forum! I hopw you find the inof you are looking for, there are a lot of people here who are very knowledgeable!
Good luck!!

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This is a pair of Dutch resistance crystal radios, built into a small metal can, and a matchbox. The image is from a postcard bought at a Dutch Resistance Museum in Amsterdam. The matchbox is marked in Swedish, but Swedish matches were sold in Holland for many years..
Scott