It's a nice watch and somewhat unusual, but not rare.
No real story to them, just another case variation for a 1970ish period Seamaster.
Some people comment that the bezel is missing and that the lugs have been polished to death but this is incorrect. The case has a flat surrounding the crystal and the rounded lugs are fresh from the factory.
The only thing that grates with me is the cyclops crystal (mine also has one that is going to get changed out.
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