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So from my understanding, dont Quote me on this….
The Proof mark was up till approximately 69, then Seiko changed to water “resist” on dial and case back. Though only for a short time into production of the 6105-8009 variant. I believe the 8000 is the International version and 8009 North America version. Or vice versa…
My 1970 is from June, And is the resist/resist- only made for a short time prior do to discontinuation of the model.
Hence the term “Rare”. Its my go to watch for all else besides wearing my Nice Omega SMPc. Unless going to a Waterpark, then the 007j or 013.
It’s like a comfortable old pair of boots, tough and reliable.
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