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It’s design concept is quirky, different and delightfully Heath Robinson but professionally packaged and built. That sounder box alone should be in the modern style museum.
As a young kid who messed about with home made night detecting devices, utilising torches, brass contacts, squarky electrical device removed from 60’ and early 70’s toys, I absolutely identify with it. If you have ever used the clip on daytime bite indicators ( can’tremember the names even though I’ve recently given one away on here) you can see the thought process behind it.
I have no idea on a price. It’s rare! It’s mint and boxed and it came from a unique angling brain so I hope you friend gets a good price for it.
Me? I’ve just spent a small fortune on fishing lately ( according to the Director of Finance, Housing and Discipline) so I would be risking divorce. I would also require two. It is however a superb man cave item.