Seiko Flightmaster

Sometimes it seems this watch does not even have a crystal -- it is so clear, even though it's a mineral crystal. 

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Beautiful watch! Very busy dial. But I love it! 🍻

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What model Flightmaster is that? I’ve not seen this one before 🤔

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By the way, what is the purpose of that screw at the top right corner?

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TonyXXX

What model Flightmaster is that? I’ve not seen this one before 🤔

SNAB67

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Jt0909

By the way, what is the purpose of that screw at the top right corner?

It's the hinge for the chrono pusher. BTW, the left crown operates the internal slide rule.

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Jojocruz

It's the hinge for the chrono pusher. BTW, the left crown operates the internal slide rule.

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That’s cool!