The Aquatimer Ref. 812AD was IWC’s first true diver’s watch. Equipped with two crowns, one crown controlling the time and the other controlling the internal dive scale bezel — it made its public debut at the 1967 Basel Fair. The classic aesthetic still looks good today. http://professionalwatches.com/2014/07/iwc-aquatimer-automatic-ref-3920-review.html

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