Rolex, Oyster "Zerograph", Ref. 3346, made in one example only of this model in 1938. Unique, center second, stainless steel gentleman's wristwatch, with single button chronograph. | The Art Of Rolex
Why the Rolex Zerographe is the coolest Rolex you've never heard of | British GQ
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Rolex Zerograph and Centregraph Mono Pusher Chronograph