Thoughts about this 1958 Seamaster?

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I also have a Bosean and find it reliable as a guide indicator. I can't testify to its absolute accuracy but it gives expected relative readings when testing 'known' radium containing watches. Handy little tool.
 
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I also have a Bosean and find it reliable as a guide indicator. I can't testify to its absolute accuracy but it gives expected relative readings when testing 'known' radium containing watches. Handy little tool.
Yes, definitely a handy little meter for that.