The f300 tuning fork was developed in the 50s by bulova. It was used in satellite technology and instruments used in space rockets. It has been used by a few watches companies including omega and tissot. The watch in the picture looks to be a nice example. They are not popular in the same way a mechanical watch is but they do have a decent following. The biggest concern is being able to get it fixed. There are companies in the UK who can fix it but depending on what is wrong with it it might be an expensive fix or you might need to find a doner movement. From a buyers point of view it would be better if it was working before buying because it is hard to know how much it will cost to fix. I am not sure how much it would sell for in non working order but personally I would pass on this one.
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