yes, it is interesting finding investigating these things! the date is actually spelled out like this, ...11 October 1941...... my fahter is trying to contact his relatives in Holland to see if they have any insight. it's very strange thought isn't it!

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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