No, there are many models that does not have the magnifying glass, or cyclops as it is more known to be called. Like for example, the submariner, Daytona, oyster perpetual, air king, the deep sea sea dweller and milgauss to name a few. But the cyclops was made a Rolex icon from the design of the datejust if I'm not mistaken. Do correct me if I'm wrong here as I am just shooting off the top of my head right now.
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