This mysterious little machine is a mechanical noise device that my grandfather made for me when I was a little kid. You give it a swing and it makes a nice noisy sound. It has a switch at the back to get two different tones. Thanks granddad.
![](http://ivobol.com/wp-content/uploads/2007/04/opaback.jpg)
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![](http://ivobol.com/wp-content/uploads/2007/04/opafront1.jpg)
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