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I am looking to sell this instrument, but it has no part numbers or any other identifying marks other than it says "Kollsman" on the back. Anyone know what it is and what it might be worth? enter image description here

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As the face says, it's a "G meter", aka "accelerometer". It measures vertical acceleration in units of "G" (i.e. acceleration due to gravity, 9.8 m/s^2 or 32 f/s^2).

Price would vary, but here's a site with a similar instrument which sold for $75 when it was in stock: https://aeroantique.com/products/accelerometer-g-meter-1?variant=39681371274

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