I need help

My brother gave this to my dad. I have no idea what's the reference but the bezel is friction based bidirectional. Is this legit or vintage?

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It’s a turn-o-graph. I’m no expert on authenticity, though.

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kvasiir

It’s a turn-o-graph. I’m no expert on authenticity, though.

What's a turn on graph? Just a simplified diver's bezel?

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DecimalZero

What's a turn on graph? Just a simplified diver's bezel?

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I forgot to mention that it's an oyster perpetual date just. If that helps

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Turn-o-graph. They're pretty rare and very cool. Congratulations!

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seattlegirrlie

Turn-o-graph. They're pretty rare and very cool. Congratulations!

Well my dad still owns it😂.. It's just needed to be maintained.