Enamel dial, Sapphire sandwich, limited edition to 1957, limited edition movement, Column Wheel, Vertical Clutch, Coaxial, Chronometer, 100m water resistance, Hacking seconds, thinner profile, best box, bracelet and strap, higher finished components...
But some of the other sought after Speedys were less limited, had some red on the dial and caseback, or a cartoon dog on the face. Makes perfect sense...
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