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Rolex

Oysters

 

are rugged and waterproof ready to go into the wild. Sapphire case backs are for dainty watches that spend a lot of their time in safes. A see through back just creates another weak point in a watch. Frankly, I would put the solid back on any watch if it came with one. I like the greater heft of the solid back and never look at the movement. If I had a minute repeater I would make an exception.

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