Actually, let's go there (we’ve already come this far). Today, the modern expression of the early 2120/2800 Royal Oak QP is the reference 26574. Originally launched in 2015, the 26574 Royal Oak Perpetual Calendar is 41mm wide, 9.5mm thick, and has 20 meters of water resistance. Along with its new size, the 26574 has an updated movement, the 5134.
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