Original 1970's ker-knockers, these are the original hard acryllic ker-knockers not modern plastic ones and so are for ADULTS ONLY
In 1970's these had various names, ker-knockers, clackers, k-nockers, k-nackers etc, they were eventually banned from school playgrounds as they were so hard!
These have the original strings and ring to slide over your finger - can you knock them together hard enough and fast enough to be able to get them to touch above and below your hand?
These are a blue/green colour in good condition, a few surface scratches and the strings are a bit grubby - probably classed as an antique now!!
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