this post was submitted on 21 Oct 2025
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What I meant was one of these:
Those were cheap, mass produced clickers or 'crickets' that were supposed to help to identify friend from foe. If you heard activity nearby you gave two clicks,and if a response wasn't given, you'd assume a foe (the call sign 'flash' and response 'thunder' was also used as they are shibboleth , hard for Germans to pronounce).
Ofc it isn't an original one, but absolutely historically correct, in that they were cheap and mass produced. It's proved to be a conversation starter and thus absolutely worth it's price.