Thanks Skipper and Flacon.
Here is something else I must read up on!!
At this rate I'll never "catch up" on my reading!!

__________________

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